--- a/handouts/ho06.tex	Wed Oct 24 13:07:13 2018 +0100
+++ b/handouts/ho06.tex	Wed Oct 24 16:03:07 2018 +0100
@@ -85,7 +85,7 @@
 grammar for arithmetic expressions we might be interested in the
 actual integer number the arithmetic expression, say \texttt{1 + 2 *
   3}, stands for. In this way we can use parser combinators to
-implement relativaley easily a calculator.
+implement relatively easily a calculator.
 
 The main idea of parser combinators is that we can easily build parser
 combinators out of smaller components following very closely the
@@ -230,7 +230,7 @@
 \end{center}
 
 \noindent Later on we will use again Scala mechanism for introducing some
-more readable shorthand notation for this, like \texttt{"a" || "b"}. Let us look in detail at what this parser combinator produces with some somple strings 
+more readable shorthand notation for this, like \texttt{"a" || "b"}. Let us look in detail at what this parser combinator produces with some sample strings 
 
 \begin{center}
 \begin{tabular}{rcl}
@@ -314,7 +314,7 @@
 \end{center}
 
 \noindent Later on we will use again Scala mechanism for introducing some
-more readable shorthand notation for this, like \texttt{"a" || "b"}. Let us look in detail at what this parser combinator produces with some somple strings 
+more readable shorthand notation for this, like \texttt{"a" || "b"}. Let us look in detail at what this parser combinator produces with some sample strings 
 
 \begin{center}
 \begin{tabular}{rcl}
@@ -353,7 +353,7 @@
 unprocessed parts of both parsers is the unprocessed parts the second
 parser $q$ produces as left-over. The processed parts of both parsers
 is just the pair of the outputs
-$(\textit{output}_1, \textit{output}_2)$. This behavious can be
+$(\textit{output}_1, \textit{output}_2)$. This behaviour can be
 implemented in Scala as follows:
 
 \begin{center}
@@ -393,7 +393,7 @@
 the empty set, then \texttt{parse} will also produce the empty set.
 Notice that we have now two output types for the sequence parser
 combinator, because in general \textit{p} and \textit{q} might produce
-differetn things (for example first we recognise a number and then a
+different things (for example first we recognise a number and then a
 string corresponding to an operator).
 
 
@@ -413,13 +413,13 @@
 \end{tabular}
 \end{center}
 
-\noindent In the first line we have a sucessful parse, because the
+\noindent In the first line we have a successful parse, because the
 string started with \texttt{ab}, which is the prefix we are looking
 for. But since the parsing combinator is constructed as sequence of
 the two simple (atomic) parsers for \texttt{a} and \texttt{b}, the
 result is a nested pair of the form \texttt{((a, b), cde)}. It is
-\emph{not} a simple pair \texttt{(ab, cde)} as one might errorneously
-expects.  The parser returns the ampty set in the other examples,
+\emph{not} a simple pair \texttt{(ab, cde)} as one might erroneously
+expects.  The parser returns the empty set in the other examples,
 because they do not fit with what the parser is supposed to parse.