diff --git a/lab-3/main_test.c b/lab-3/main_test.c
index 7153e6a..6205cc0 100644
--- a/lab-3/main_test.c
+++ b/lab-3/main_test.c
@@ -44,7 +44,7 @@ UTEST(scanner, hello) {
   int index = 0;
   token_t t;
   do {
-    printf("index: %d token: %d text: %s\n", index, t, yytext);
+    // printf("index: %d token: %d text: %s\n", index, t, yytext);
     ASSERT_EQ(tokens[index].t, (t = yylex()));
     ASSERT_STREQ(tokens[index].p, yytext);
     ++index;
diff --git a/lab-4/parser.bison b/lab-4/parser.bison
index 6d1a7f6..451e66c 100644
--- a/lab-4/parser.bison
+++ b/lab-4/parser.bison
@@ -60,22 +60,9 @@ int yylex();
 %token TOKEN_EXPONENTIAL
 
 %%
-program : expr TOKEN_SEMI;
 
-expr : expr TOKEN_PLUS term
-    | expr TOKEN_MINUS term
-    | term
-    ;
 
-term : term TOKEN_MUL factor
-    | term TOKEN_DIV factor
-    | factor
-    ;
 
-factor: TOKEN_MINUS factor
-    | TOKEN_LPAREN expr TOKEN_RPAREN
-    | TOKEN_INT
-    ;
 %%
 void yyerror(const char* msg) {
     fprintf(stderr, "Error | Line: %d\n%s\n",yylineno,msg);