5 files changed, 11 insertions, 12 deletions
diff --git a/chapter04/docs/04-grammar.md b/chapter04/docs/04-grammar.md
index 51d5dbea..48facd4c 100644
--- a/chapter04/docs/04-grammar.md
+++ b/chapter04/docs/04-grammar.md
@@ -10,7 +10,7 @@ program
 statement
     : returnStatement
     | declStatement
-    | blockStatment 
+    | blockStatment
     | expressionStatement
     | metaStatement
     ;
@@ -38,15 +38,15 @@ returnStatement
 expression
     : comparisonExpression
     ;
-    
+
 comparisonExpression
     : additiveExpression (('==' | '!='| '>'| '<'| '>='| '<=') additiveExpression)*
     ;
-    
+
 additiveExpression
-    : multiplicativeExpression (('+' | '-') multiplicativeExpression)*    
+    : multiplicativeExpression (('+' | '-') multiplicativeExpression)*
     ;
-    
+
 multiplicativeExpression
     : unaryExpression (('*' | '/') unaryExpression)*
     ;
@@ -66,11 +66,11 @@ INTEGER_LITERAL
     : [1-9][0-9]*
     | [0]
     ;
-    
+
 IDENTIFIER
     : NON_DIGIT (NON_DIGIT | DIGIT)*
     ;
-    
+
 NON_DIGIT: [a-zA-Z_];
 DEC_DIGIT: [0-9];
-```
-\ No newline at end of file
+```
diff --git a/chapter04/docs/04-post-peephole.gv b/chapter04/docs/04-post-peephole.gv
index 51e176bc..0a9f8e93 100644
--- a/chapter04/docs/04-post-peephole.gv
+++ b/chapter04/docs/04-post-peephole.gv
@@ -40,4 +40,4 @@ return 1+arg+2; #showGraph;
 	Return12 -> Add11[taillabel=1];
 	edge [style=dashed color=cornflowerblue];
 	Scope1_0:"Scope1_0_arg" -> Start2:p1;
-}
-\ No newline at end of file
+}
diff --git a/chapter04/docs/04-pre-peephole.gv b/chapter04/docs/04-pre-peephole.gv
index b6fefc2d..aefd81c4 100644
--- a/chapter04/docs/04-pre-peephole.gv
+++ b/chapter04/docs/04-pre-peephole.gv
@@ -44,4 +44,4 @@ return 1+arg+2; #showGraph;
 	Return9 -> Add8[taillabel=1];
 	edge [style=dashed color=cornflowerblue];
 	Scope1_0:"Scope1_0_arg" -> Start2:p1;
-}
-\ No newline at end of file
+}
diff --git a/chapter04/docs/build-graphs.sh b/chapter04/docs/build-graphs.sh
index d8038602..e736a386 100644
--- a/chapter04/docs/build-graphs.sh
+++ b/chapter04/docs/build-graphs.sh
@@ -1,2 +1 @@
 dot -Tsvg  lattice.gv > lattice.svg
-
diff --git a/chapter04/docs/lattice.gv b/chapter04/docs/lattice.gv
index 2644448e..1f286530 100644
--- a/chapter04/docs/lattice.gv
+++ b/chapter04/docs/lattice.gv
@@ -60,4 +60,4 @@ digraph Lattice {
                 INT_MAX; TUPLE}
     {rank=same; INT_BOT}
     {rank=same; BOT;}
-}
-\ No newline at end of file
+}