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--- a/LINKS	Mon Jan 01 15:02:03 2018 +0000
+++ b/LINKS	Thu Feb 01 21:06:20 2018 +0000
@@ -1,3 +1,25 @@
+Pictures from teh Starting Forth book
+
+https://www.forth.com/starting-forth/2-stack-manipulation-operators-arithmetic/
+
+--------------------------------
+
+Yeti - ML for the JVM
+https://mth.github.io/yeti/
+http://dot.planet.ee/yeti/intro.html
+
+
+JVM languages
+https://en.wikipedia.org/wiki/List_of_JVM_languages
+https://www.codeproject.com/Articles/50377/Create-Your-Own-Programming-Language
+
+
+Scheme
+https://wespiser.com/writings/wyas/home.html
+http://peter.michaux.ca/index#Scheme
+
+
+
 assmebly (calculator RPN)
 
 https://dere.github.io/2017-02-12/beginners-assembly-part1/

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--- a/progs/re1.scala	Mon Jan 01 15:02:03 2018 +0000
+++ b/progs/re1.scala	Thu Feb 01 21:06:20 2018 +0000
@@ -50,6 +50,12 @@
 der('b', r)
 der('c', r)
 
+val r = SEQ(SEQ(CHAR('x'), CHAR('y')), CHAR('z'))
+der('x', r)
+der('y', der('x', r))
+der('z', der('y', der('x', r)))
+
+
 //optional regular expression (one or zero times)
 def OPT(r: Rexp) = ALT(r, ONE)
 

--- a/progs/re4.scala	Mon Jan 01 15:02:03 2018 +0000
+++ b/progs/re4.scala	Thu Feb 01 21:06:20 2018 +0000
@@ -52,6 +52,13 @@
   case r => r
 }
 
+//example
+val r = SEQ(SEQ(CHAR('x'), CHAR('y')), CHAR('z'))
+der('x', r)
+der('y', der('x', r))
+der('z', der('y', der('x', r)))
+simp(der('z', der('y', der('x', r))))
+
 // *new*
 // derivative w.r.t. a string (iterates der)
 def ders2(s: List[Char], r: Rexp) : Rexp = (s, r) match {