diff --git a/src/modal.c b/src/modal.c
index ff74cc4..e04ae04 100644
--- a/src/modal.c
+++ b/src/modal.c
@@ -4,7 +4,7 @@ typedef struct {
 	char *a, *b;
 } Rule;
 
-static int rules_len;
+static int rules_len, direction = 0;
 static Rule rules[0x100];
 static char dict[0x8000], *dict_ = dict;
 static char bank_a[0x1000], *prog_ = bank_a;
@@ -89,11 +89,11 @@ bind(char r)
 static void
 save(int rule)
 {
-	int i, end = outp_ - bank_b;
-	/* todo: change pointer instead of copying memory */
-	for(i = 0; i <= end; i++) bank_a[i] = bank_b[i];
-	prog_ = bank_a, outp_ = bank_b;
-	printf("%02d %s\n", rule, bank_a);
+	if((direction = !direction))
+		prog_ = bank_b, outp_ = bank_a;
+	else
+		prog_ = bank_a, outp_ = bank_b;
+	printf("%02d %s\n", rule, direction ? bank_b : bank_a);
 }
 
 static char *
@@ -138,7 +138,7 @@ addrule(char *s)
 static int
 rewrite(void)
 {
-	char c, *p = bank_a;
+	char c, *p = direction ? bank_b : bank_a;
 	while((c = *p)) {
 		int i;
 		if(p[0] == '<' && p[1] == '>')