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+++ b/videos/01-housekeeping.srt	Sat Sep 26 23:45:40 2020 +0100
@@ -0,0 +1,1218 @@
+1
+00:00:05,750 --> 00:00:10,395
+They come back! Before we can
+start with any serious work,
+
+2
+00:00:10,395 --> 00:00:12,255
+let's do some housekeeping.
+
+3
+00:00:12,255 --> 00:00:17,380
+As you know, this year is a tad special.
+While the broad direction is clear,
+
+4
+00:00:17,380 --> 00:00:19,730
+there are some organizational
+details that
+
+5
+00:00:19,730 --> 00:00:22,370
+still need to be worked
+out as we go along.
+
+6
+00:00:22,370 --> 00:00:23,930
+The main hub for
+
+7
+00:00:23,930 --> 00:00:27,215
+all the information is the
+KEATS page of this module.
+
+8
+00:00:27,215 --> 00:00:29,300
+Let me say a few words on how
+
+9
+00:00:29,300 --> 00:00:35,269
+it is organized. The module is
+organized into weekly topics.
+
+10
+00:00:35,269 --> 00:00:39,785
+So there are entries for weeks
+one up till week ten.
+
+11
+00:00:39,785 --> 00:00:44,390
+Let's also proceed in
+approximately weekly steps.
+
+12
+00:00:44,390 --> 00:00:46,790
+Because if you
+already asked me in
+
+13
+00:00:46,790 --> 00:00:49,130
+week two something
+about week ten,
+
+14
+00:00:49,130 --> 00:00:51,275
+then you might confuse me
+
+15
+00:00:51,275 --> 00:00:53,720
+and also your fellow students.
+
+16
+00:00:53,720 --> 00:00:55,970
+All the communication in
+
+17
+00:00:55,970 --> 00:00:59,945
+this module can be done in
+the course discussion area.
+
+18
+00:00:59,945 --> 00:01:02,300
+You can ask any questions.
+
+19
+00:01:02,300 --> 00:01:05,465
+For example, I haven't
+understood this point,
+
+20
+00:01:05,465 --> 00:01:07,910
+this video isn't clear,
+
+21
+00:01:07,910 --> 00:01:10,160
+I cannot run this code,
+
+22
+00:01:10,160 --> 00:01:13,910
+I have problems with
+accessing the coursework.
+
+23
+00:01:13,910 --> 00:01:16,295
+This can be all discussed here.
+
+24
+00:01:16,295 --> 00:01:18,590
+If you have any private matter,
+
+25
+00:01:18,590 --> 00:01:20,900
+like, I can't understand why
+
+26
+00:01:20,900 --> 00:01:23,465
+did I get such a good
+mark, for example?
+
+27
+00:01:23,465 --> 00:01:27,245
+Or there are some private
+reasons why you can't keep up.
+
+28
+00:01:27,245 --> 00:01:31,430
+Please feel free to use
+my private email address.
+
+29
+00:01:31,430 --> 00:01:35,630
+But for any other matter
+related to the module,
+
+30
+00:01:35,630 --> 00:01:38,480
+try to use the course
+discussion area.
+
+31
+00:01:38,480 --> 00:01:41,510
+And I will try to stay on top
+
+32
+00:01:41,510 --> 00:01:45,450
+of all the discussions
+as much as I can.
+
+33
+00:01:45,580 --> 00:01:48,500
+Each week is organized into
+
+34
+00:01:48,500 --> 00:01:52,550
+a mandatory section and
+an optional section.
+
+35
+00:01:52,550 --> 00:01:55,835
+The mandatory section
+contains videos,
+
+36
+00:01:55,835 --> 00:01:58,190
+a handout, and the slides,
+
+37
+00:01:58,190 --> 00:02:00,725
+which I used to
+produce the videos.
+
+38
+00:02:00,725 --> 00:02:04,324
+I recommend that your
+first read the handouts,
+
+39
+00:02:04,324 --> 00:02:07,430
+then watch the videos and then
+
+40
+00:02:07,430 --> 00:02:11,030
+read the handout
+again for each week.
+
+41
+00:02:11,030 --> 00:02:14,795
+Apologies, some of these
+handouts are quite lengthy.
+
+42
+00:02:14,795 --> 00:02:17,615
+I think the longest
+one is 20 pages.
+
+43
+00:02:17,615 --> 00:02:19,235
+On the good side,
+
+44
+00:02:19,235 --> 00:02:21,650
+these handouts are
+written in such a way
+
+45
+00:02:21,650 --> 00:02:24,935
+that you can read them just
+before you fall asleep
+
+46
+00:02:24,935 --> 00:02:26,720
+and you should still be able
+
+47
+00:02:26,720 --> 00:02:28,835
+to understand what is going on.
+
+48
+00:02:28,835 --> 00:02:32,105
+Also, they contain lots
+of pictures and code.
+
+49
+00:02:32,105 --> 00:02:35,330
+So 20 pages is
+a bit misleading.
+
+50
+00:02:35,330 --> 00:02:38,870
+You can see the second week
+is organized similarly.
+
+51
+00:02:38,870 --> 00:02:41,030
+You will have some videos.
+
+52
+00:02:41,030 --> 00:02:42,260
+You will have a handout,
+
+53
+00:02:42,260 --> 00:02:43,624
+you have the slides,
+
+54
+00:02:43,624 --> 00:02:45,770
+and some optional resources.
+
+55
+00:02:45,770 --> 00:02:51,410
+I have also put up a general
+section, with general
+
+56
+00:02:51,410 --> 00:02:57,965
+material, where I put
+a PDF about my notation.
+
+57
+00:02:57,965 --> 00:03:01,385
+This might be very
+useful because
+
+58
+00:03:01,385 --> 00:03:04,610
+remember this topic
+is already many,
+
+59
+00:03:04,610 --> 00:03:07,445
+many decades old,
+at least 50 years,
+
+60
+00:03:07,445 --> 00:03:09,185
+and over the time,
+
+61
+00:03:09,185 --> 00:03:11,510
+many authors and many lecturers
+
+62
+00:03:11,510 --> 00:03:13,745
+have introduced
+their own notation.
+
+63
+00:03:13,745 --> 00:03:16,565
+So if you read anything
+on the web or in books,
+
+64
+00:03:16,565 --> 00:03:19,640
+you might be confused about that
+
+65
+00:03:19,640 --> 00:03:24,035
+they call something, which
+I call X, they call Y.
+
+66
+00:03:24,035 --> 00:03:26,150
+So in this PDF,
+
+67
+00:03:26,150 --> 00:03:30,320
+I have collected all the
+information on what kind of
+
+68
+00:03:30,320 --> 00:03:34,940
+notation I am using and where
+I introduce some shortcuts.
+
+69
+00:03:34,940 --> 00:03:38,240
+The problem is, you always
+want to be precise,
+
+70
+00:03:38,240 --> 00:03:40,070
+but we also lazy.
+
+71
+00:03:40,070 --> 00:03:43,745
+We don't want to write
+everything into the last detail.
+
+72
+00:03:43,745 --> 00:03:47,375
+So here I say something
+about my notation.
+
+73
+00:03:47,375 --> 00:03:50,180
+I have also put up
+a document about
+
+74
+00:03:50,180 --> 00:03:53,510
+the Scala I'm going to
+use in this module.
+
+75
+00:03:53,510 --> 00:03:56,090
+This is important
+for the coursework.
+
+76
+00:03:56,090 --> 00:03:58,175
+In the coursework which
+will come in a moment,
+
+77
+00:03:58,175 --> 00:04:00,440
+you can use any
+programming language you like
+
+78
+00:04:00,440 --> 00:04:03,665
+to solve the questions and
+implement your code.
+
+79
+00:04:03,665 --> 00:04:05,615
+But, I'm sorry,
+
+80
+00:04:05,615 --> 00:04:09,830
+all the code I'm going to
+show you will be in Scala.
+
+81
+00:04:09,830 --> 00:04:12,155
+And the main difference is that
+
+82
+00:04:12,155 --> 00:04:15,095
+between PEP course from last year
+
+83
+00:04:15,095 --> 00:04:17,675
+is that I'm going to
+use the Ammonite
+
+84
+00:04:17,675 --> 00:04:21,170
+REPL instead of
+the Scala REPL.
+
+85
+00:04:21,170 --> 00:04:23,615
+They work very similarly.
+
+86
+00:04:23,615 --> 00:04:26,070
+For example,
+
+87
+00:04:28,120 --> 00:04:33,710
+I can now evaluate code
+and get a feedback of what
+
+88
+00:04:33,710 --> 00:04:37,100
+it calculates, just like the original one.
+
+89
+00:04:37,100 --> 00:04:40,220
+The difference is that
+Ammonite is
+
+90
+00:04:40,220 --> 00:04:42,440
+an extension and
+provides some features
+
+91
+00:04:42,440 --> 00:04:44,975
+which will be very useful for us.
+
+92
+00:04:44,975 --> 00:04:47,600
+And I recorded some
+of the features
+
+93
+00:04:47,600 --> 00:04:50,970
+we are going to use
+in this document.
+
+94
+00:04:52,330 --> 00:04:55,970
+The last point to note
+on the KEATS webpage
+
+95
+00:04:55,970 --> 00:04:59,405
+is that in the optional section,
+
+96
+00:04:59,405 --> 00:05:02,270
+I will always give
+the source code of
+
+97
+00:05:02,270 --> 00:05:05,845
+the programs I discussed
+in the videos and in the handouts.
+
+98
+00:05:05,845 --> 00:05:08,420
+And I really, really
+encourage you
+
+99
+00:05:08,420 --> 00:05:11,060
+that you play around with this code
+
+100
+00:05:11,060 --> 00:05:14,420
+to make sure you understand
+what was discussed.
+
+101
+00:05:14,420 --> 00:05:17,540
+At the also have sometimes
+some additional pointers
+
+102
+00:05:17,540 --> 00:05:19,490
+to interesting topics, which
+
+103
+00:05:19,490 --> 00:05:22,680
+you can read up in your own time.
+
+104
+00:05:22,690 --> 00:05:26,240
+Exams, I'm sorry,
+there will be exams.
+
+105
+00:05:26,240 --> 00:05:31,760
+There will be a final exam in
+January, counting for 30%.
+
+106
+00:05:31,760 --> 00:05:34,190
+There will be a
+midterm shortly after
+
+107
+00:05:34,190 --> 00:05:37,565
+Reading Week, accounting for 10%.
+
+108
+00:05:37,565 --> 00:05:40,625
+This will be a normal exams,
+
+109
+00:05:40,625 --> 00:05:44,780
+just that they will be online
+in some form or shape.
+
+110
+00:05:44,780 --> 00:05:49,939
+There will be also a weekly
+engagement component.
+
+111
+00:05:49,939 --> 00:05:52,370
+So 1% in each week,
+
+112
+00:05:52,370 --> 00:05:56,360
+where I make sure that
+you are engaged with
+
+113
+00:05:56,360 --> 00:06:01,625
+the material and you will
+get 1% each week for that.
+
+114
+00:06:01,625 --> 00:06:06,020
+How that is going to be
+working out in practice,
+
+115
+00:06:06,020 --> 00:06:08,000
+unfortunately, I do not know
+
+116
+00:06:08,000 --> 00:06:11,285
+yet what tools we use
+or what it means,
+
+117
+00:06:11,285 --> 00:06:13,685
+but I will let you know about it.
+
+118
+00:06:13,685 --> 00:06:19,295
+There's also an optional
+weekly homework.
+
+119
+00:06:19,295 --> 00:06:22,999
+The homework is
+uploaded on KEATS.
+
+120
+00:06:22,999 --> 00:06:27,230
+You should send your answers
+via email to me.
+
+121
+00:06:27,230 --> 00:06:31,955
+I will respond individually
+and give some feedback.
+
+122
+00:06:31,955 --> 00:06:33,920
+Normally, if everything is okay
+
+123
+00:06:33,920 --> 00:06:36,605
+with a question, I will
+just respond "OK"?
+
+124
+00:06:36,605 --> 00:06:38,630
+If there is
+something wrong,
+
+125
+00:06:38,630 --> 00:06:41,060
+I will sometimes answer with a longer
+
+126
+00:06:41,060 --> 00:06:44,480
+email. All the questions in
+
+127
+00:06:44,480 --> 00:06:49,415
+the exam and in the midterm
+will be from this homework.
+
+128
+00:06:49,415 --> 00:06:53,330
+So I do not give out the
+solutions to the homework.
+
+129
+00:06:53,330 --> 00:06:55,415
+You have to email me first
+
+130
+00:06:55,415 --> 00:06:57,290
+what do you think
+the solution is...
+
+131
+00:06:57,290 --> 00:07:01,280
+and I will give answers
+individually back.
+
+132
+00:07:01,280 --> 00:07:05,270
+And I will then ensure
+that all the questions in
+
+133
+00:07:05,270 --> 00:07:09,560
+the exam and the midterm coming
+only from this homework.
+
+134
+00:07:09,560 --> 00:07:11,825
+The simple reason for that is
+
+135
+00:07:11,825 --> 00:07:14,645
+that I hate if students ask me
+
+136
+00:07:14,645 --> 00:07:17,705
+if something is relevant
+for the exam or not.
+
+137
+00:07:17,705 --> 00:07:21,620
+I really like this material
+and whatever I tell you,
+
+138
+00:07:21,620 --> 00:07:23,840
+I feel like you
+should know about it.
+
+139
+00:07:23,840 --> 00:07:26,645
+So, to prevent that question,
+
+140
+00:07:26,645 --> 00:07:28,415
+if it's relevant to the exams,
+
+141
+00:07:28,415 --> 00:07:32,165
+you can just look at
+what's in the homework.
+
+142
+00:07:32,165 --> 00:07:34,370
+And if this question
+is in the homework,
+
+143
+00:07:34,370 --> 00:07:36,335
+then yes, it will be relevant.
+
+144
+00:07:36,335 --> 00:07:40,410
+And if not, it will
+not. Thank you.
+
+145
+00:07:42,280 --> 00:07:46,610
+Can you please make one more
+point about the homework?
+
+146
+00:07:46,610 --> 00:07:50,959
+Please submit your
+answers only as PDF.
+
+147
+00:07:50,959 --> 00:07:53,780
+That just makes it easy
+for me to look at.
+
+148
+00:07:53,780 --> 00:07:55,160
+Remember, I might get
+
+149
+00:07:55,160 --> 00:07:58,820
+60 or more emails about
+
+150
+00:07:58,820 --> 00:08:03,110
+that and it's just much
+easier for me to read PDFs.
+
+151
+00:08:03,110 --> 00:08:07,880
+Also, please in your answer
+copy the question.
+
+152
+00:08:07,880 --> 00:08:11,480
+I have an extremely limited memory
+
+153
+00:08:11,480 --> 00:08:15,290
+and have no idea what I actually
+asked in this homework until
+
+154
+00:08:15,290 --> 00:08:16,910
+I actually look it up.
+
+155
+00:08:16,910 --> 00:08:18,530
+Just to prevent that,
+
+156
+00:08:18,530 --> 00:08:20,255
+that I have to look it up myself,
+
+157
+00:08:20,255 --> 00:08:23,765
+please send in
+always the question
+
+158
+00:08:23,765 --> 00:08:26,330
+and then give your answer.
+
+159
+00:08:26,330 --> 00:08:29,915
+And finally, there are some
+
+160
+00:08:29,915 --> 00:08:32,540
+optional homework. They are just to
+
+161
+00:08:32,540 --> 00:08:34,130
+reminders actually that
+
+162
+00:08:34,130 --> 00:08:36,140
+you really should
+have a look at that.
+
+163
+00:08:36,140 --> 00:08:39,830
+But they're optional. The ones
+
+164
+00:08:39,830 --> 00:08:43,520
+that you are supposed to
+solve, they look like this.
+
+165
+00:08:43,520 --> 00:08:45,890
+And as I said,
+
+166
+00:08:45,890 --> 00:08:50,645
+please copy the question
+and then give your answer.
+
+167
+00:08:50,645 --> 00:08:53,780
+And at the end,
+package it into a PDF.
+
+168
+00:08:53,780 --> 00:08:58,505
+Thank you. A very
+important component
+
+169
+00:08:58,505 --> 00:09:02,240
+for assessment in this
+module is the coursework.
+
+170
+00:09:02,240 --> 00:09:04,160
+There will be five of them.
+
+171
+00:09:04,160 --> 00:09:06,590
+We will first implement a matcher.
+
+172
+00:09:06,590 --> 00:09:09,770
+Then a lexer building
+on top of the matcher.
+
+173
+00:09:09,770 --> 00:09:13,655
+Then build a parser
+and an interpreter.
+
+174
+00:09:13,655 --> 00:09:16,730
+And then a
+compiler for the JVM
+
+175
+00:09:16,730 --> 00:09:20,420
+and a compiler
+targetting the LLVM.
+
+176
+00:09:20,420 --> 00:09:24,155
+So you can see this
+accounts for 45%.
+
+177
+00:09:24,155 --> 00:09:27,200
+You will submit your
+code and you also have
+
+178
+00:09:27,200 --> 00:09:30,260
+to give some explanation
+about your code.
+
+179
+00:09:30,260 --> 00:09:31,520
+This will be always
+
+180
+00:09:31,520 --> 00:09:34,655
+explained in the
+coursework description.
+
+181
+00:09:34,655 --> 00:09:36,785
+For the coursework, you can use
+
+182
+00:09:36,785 --> 00:09:38,945
+any programming
+language you like.
+
+183
+00:09:38,945 --> 00:09:42,860
+In the past, people have
+used Haskell and Rust.
+
+184
+00:09:42,860 --> 00:09:45,905
+Obviously many go for Scala.
+
+185
+00:09:45,905 --> 00:09:49,730
+You can use any code
+I showed you in
+
+186
+00:09:49,730 --> 00:09:54,230
+the videos or in handouts
+or uploaded on KEATS.
+
+187
+00:09:54,230 --> 00:09:56,390
+But nothing else.
+
+188
+00:09:56,390 --> 00:09:59,450
+Remember, unlike
+in the PEP course,
+
+189
+00:09:59,450 --> 00:10:02,030
+here, in the Compiler course,
+
+190
+00:10:02,030 --> 00:10:04,130
+I actually will look with
+
+191
+00:10:04,130 --> 00:10:07,910
+my own eyes at the submissions
+and make judgments.
+
+192
+00:10:07,910 --> 00:10:13,775
+And I'll see if people have
+copied from each other.
+
+193
+00:10:13,775 --> 00:10:15,545
+Please don't do that!
+
+194
+00:10:15,545 --> 00:10:20,160
+That's very annoying
+for everybody involved.
+
+195
+00:10:20,440 --> 00:10:23,570
+To conclude this
+housekeeping video,
+
+196
+00:10:23,570 --> 00:10:25,580
+let me tell you a
+bit more about how
+
+197
+00:10:25,580 --> 00:10:28,025
+this module is organized.
+
+198
+00:10:28,025 --> 00:10:32,600
+The first five weeks we will
+spend on lexing and parsing.
+
+199
+00:10:32,600 --> 00:10:37,370
+This is essentially the
+frontend to our compiler.
+
+200
+00:10:37,370 --> 00:10:39,500
+The first part will
+be about lexing.
+
+201
+00:10:39,500 --> 00:10:42,995
+Actually, we will emphasize quite a
+bit on the lexing part,
+
+202
+00:10:42,995 --> 00:10:45,005
+because that's about my research.
+
+203
+00:10:45,005 --> 00:10:47,855
+And sorry, I can talk
+about this for hours.
+
+204
+00:10:47,855 --> 00:10:49,400
+But I also like to show you that
+
+205
+00:10:49,400 --> 00:10:50,750
+there's actually something really
+
+206
+00:10:50,750 --> 00:10:52,340
+interesting going on and
+I want to
+
+207
+00:10:52,340 --> 00:10:54,529
+show you a number of techniques.
+
+208
+00:10:54,529 --> 00:10:57,435
+Then obviously we have
+to do parsing because
+
+209
+00:10:57,435 --> 00:11:01,669
+lexing essentially only
+finds the words in our programs.
+
+210
+00:11:01,669 --> 00:11:03,860
+We then have to put
+them into sentences to
+
+211
+00:11:03,860 --> 00:11:07,350
+understand what our
+programs actually do.
+
+212
+00:11:09,820 --> 00:11:12,200
+The next five weeks,
+
+213
+00:11:12,200 --> 00:11:15,330
+actually that overlaps
+with the parsing part,
+
+214
+00:11:15,330 --> 00:11:18,850
+we will first start with
+writing an interpreter.
+
+215
+00:11:18,850 --> 00:11:20,470
+This is essentially to get
+
+216
+00:11:20,470 --> 00:11:22,285
+the baseline for our compiler.
+
+217
+00:11:22,285 --> 00:11:24,325
+Also, you will see compilers are
+
+218
+00:11:24,325 --> 00:11:27,370
+sometimes fiendishly
+difficult to get correct.
+
+219
+00:11:27,370 --> 00:11:30,880
+And to actually know what
+the results should be, 
+
+220
+00:11:30,880 --> 00:11:32,320
+by having it calculated with
+
+221
+00:11:32,320 --> 00:11:35,515
+an interpreter, is
+really important.
+
+222
+00:11:35,515 --> 00:11:40,030
+And then we really
+spent time on a compiler.
+
+223
+00:11:40,030 --> 00:11:45,310
+We will first write JVM code
+for a little While language.
+
+224
+00:11:45,310 --> 00:11:46,780
+That is an extremely,
+
+225
+00:11:46,780 --> 00:11:50,335
+extremely simple C-like
+language, if you want.
+
+226
+00:11:50,335 --> 00:11:53,770
+And also JVM Code for
+a functional language.
+
+227
+00:11:53,770 --> 00:11:55,615
+Again, something very small.
+
+228
+00:11:55,615 --> 00:11:57,815
+And then for that
+functional language
+
+229
+00:11:57,815 --> 00:12:03,080
+also generate LLVM-IR code
+that can be
+
+230
+00:12:03,080 --> 00:12:09,270
+then used to generate directly
+CPU code for X86 or ARM.
+
+231
+00:12:09,460 --> 00:12:12,095
+Just to whet your appetite,
+
+232
+00:12:12,095 --> 00:12:14,780
+here's the first compiler for
+
+233
+00:12:14,780 --> 00:12:20,240
+the While-language calculating
+the Mandelbrot program.
+
+234
+00:12:20,240 --> 00:12:22,160
+It generates code for
+
+235
+00:12:22,160 --> 00:12:25,460
+the JVM, for the Java
+virtual machine.
+
+236
+00:12:25,460 --> 00:12:27,350
+So what it first does, like in
+
+237
+00:12:27,350 --> 00:12:29,855
+the example I showed you earlier,
+
+238
+00:12:29,855 --> 00:12:33,215
+it takes the Mandelbrot
+program from the BF language,
+
+239
+00:12:33,215 --> 00:12:35,480
+generates a While program
+
+240
+00:12:35,480 --> 00:12:38,520
+in our language we are
+going to implement...
+
+241
+00:12:38,530 --> 00:12:40,940
+this has produced a program which is
+
+242
+00:12:40,940 --> 00:12:44,795
+approximately 70k of source code.
+
+243
+00:12:44,795 --> 00:12:47,585
+Then our compiler produced
+
+244
+00:12:47,585 --> 00:12:53,015
+a Java Virtual Machine
+byte code file.
+
+245
+00:12:53,015 --> 00:12:54,890
+This is the readable version of
+
+246
+00:12:54,890 --> 00:12:57,500
+the Java Virtual Machine bytecode.
+
+247
+00:12:57,500 --> 00:12:59,480
+And we use then an assembler
+
+248
+00:12:59,480 --> 00:13:01,535
+to actually produce
+the class file.
+
+249
+00:13:01,535 --> 00:13:04,460
+And then this compiler
+just runs this class file.
+
+250
+00:13:04,460 --> 00:13:06,830
+It takes a little while and
+unfortunately this compiler
+
+251
+00:13:06,830 --> 00:13:09,365
+doesn't show it incrementally.
+Only at the end
+
+252
+00:13:09,365 --> 00:13:13,205
+it shows us it needed
+approximately 40 seconds.
+
+253
+00:13:13,205 --> 00:13:16,745
+And you have to
+remember the GCC with -O0
+
+254
+00:13:16,745 --> 00:13:21,485
+took a little
+bit more than 20 seconds.
+
+255
+00:13:21,485 --> 00:13:24,440
+And so this is quite
+remarkable result
+
+256
+00:13:24,440 --> 00:13:27,575
+considering we are
+running it on the JVM.
+
+257
+00:13:27,575 --> 00:13:29,345
+Just to assure you,
+
+258
+00:13:29,345 --> 00:13:33,245
+the Mandelbrot program will not be the
+only program we can compile.
+
+259
+00:13:33,245 --> 00:13:36,380
+But we will focus on integers
+
+260
+00:13:36,380 --> 00:13:39,605
+and strings in our
+programming language.
+
+261
+00:13:39,605 --> 00:13:43,280
+Because for more complicated
+data structures 
+
+262
+00:13:43,280 --> 00:13:46,250
+we don't have enough time
+to fit into this module.
+
+263
+00:13:46,250 --> 00:13:49,040
+So let's start now
+with the serious work.
+
+264
+00:13:49,040 --> 00:13:52,020
+I hope I see you in a bit.