diff --git a/labs/04/lex3.1/code_generator.py b/labs/04/lex3.1/code_generator.py
new file mode 100644
index 0000000..b4ca41d
--- /dev/null
+++ b/labs/04/lex3.1/code_generator.py
@@ -0,0 +1,77 @@
+import string
+import random
+import argparse
+
+def id_generator(size=10, chars=string.ascii_uppercase + string.digits):
+    return ''.join(random.choice(chars) for _ in range(size))
+
+opreators = ["+","-","*","/"]
+
+def get_comment_line():
+    comment_line = "//%s" % (id_generator())
+    return comment_line
+
+def get_float_line():
+    float_line = "f %s" % (random.choice(string.ascii_lowercase))
+    return float_line
+
+def get_integer_line():
+    integer_line = "i %s"% (random.choice(string.ascii_lowercase))
+    return integer_line
+
+def get_asigment_line():
+    asigment_line = "%s = %s" %(random.choice(string.ascii_lowercase),\
+        random.randint(0,100))
+    return asigment_line
+
+def get_asigment_line_2():
+    asigment_line_2 = "%s = %s %s %s" % \
+            (random.choice(string.ascii_lowercase),\
+            random.choice(string.ascii_lowercase),\
+            random.choice(opreators),\
+            random.randint(0,100))
+    return asigment_line_2
+
+def get_print_line():
+    print_line = "p %s" % (random.choice(string.ascii_lowercase))
+    return print_line
+
+
+parser = argparse.ArgumentParser(description='Generate random AC code')
+parser.add_argument('--stress', dest='stress', action='store_true',\
+        help='generate HUGE code to stress the lab')
+args = parser.parse_args()
+
+if args.stress:
+    f= open("random_code.ac","w+")
+    for x in range(0, 100000):
+        comment_line = get_comment_line()
+        float_line = get_float_line()
+        integer_line = get_integer_line()
+        asigment_line = get_asigment_line()
+        asigment_line_2 = get_asigment_line_2()
+        print_line = get_print_line()
+
+        f.write(comment_line + "\n")
+        f.write(float_line + "\n")
+        f.write(integer_line + "\n")
+        f.write(asigment_line+ "\n")
+        f.write(asigment_line_2 + "\n")
+        f.write(print_line + "\n")
+
+    f.close()
+
+else:
+    comment_line = get_comment_line()
+    float_line = get_float_line()
+    integer_line = get_integer_line()
+    asigment_line = get_asigment_line()
+    asigment_line_2 = get_asigment_line_2()
+    print_line = get_print_line()
+
+    print(comment_line)
+    print(float_line)
+    print(integer_line)
+    print(asigment_line)
+    print(asigment_line_2)
+    print(print_line)
\ No newline at end of file
diff --git a/labs/04/lex3.1/example.ac b/labs/04/lex3.1/example.ac
new file mode 100644
index 0000000..bb5a51b
--- /dev/null
+++ b/labs/04/lex3.1/example.ac
@@ -0,0 +1,6 @@
+//MA9NGAKULA
+f k
+i l
+m = 0
+r = r + 13
+p a
diff --git a/labs/04/lex3.1/lex_analaizer.l b/labs/04/lex3.1/lex_analaizer.l
new file mode 100644
index 0000000..fd7c348
--- /dev/null
+++ b/labs/04/lex3.1/lex_analaizer.l
@@ -0,0 +1,35 @@
+%{
+#include <stdio.h>
+%}
+%option noyywrap
+
+%%
+"f"[ \t]+                printf("floatdcl ");
+"i"[ \t]+                printf("intdcl ");
+"p"[ \t]+                printf("print ");
+"="                      printf("assign ");
+"+"                      printf("plus ");
+"//".*                   printf("COMMENT ");
+[0-9]+\.[0-9]+           printf("fnum ");
+[0-9]+                   printf("inum ");
+[a-z]                    printf("id ");
+[ \t\n]+                 /* ignore whitespace */;
+%%
+
+int main(int argc, char **argv) {
+    FILE    *fd;
+    if (argc == 2)
+    {
+        if (!(fd = fopen(argv[1], "r")))
+        {
+            perror("Error: ");
+            return (-1);
+        }
+        yyset_in(fd);
+        yylex();
+        fclose(fd);
+    }
+    else
+        printf("Usage: a.out filename\n");
+    return (0);
+}
\ No newline at end of file
diff --git a/labs/04/lex3.1/lex_analizer b/labs/04/lex3.1/lex_analizer
new file mode 100755
index 0000000..a699cab
Binary files /dev/null and b/labs/04/lex3.1/lex_analizer differ