diff --git a/examples/adventure.modal b/examples/adventure.modal
new file mode 100644
index 0000000..26c81f7
--- /dev/null
+++ b/examples/adventure.modal
@@ -0,0 +1,9 @@
+<> ((You said: quit\n) send) ((You quit.) print ')
+<> (?: print ') (?:)
+<> (?: send) (?: wait)
+<> (wait) ((You said: ?~\n) send)
+<> (' ?x) (?x ')
+
+(Say something, or type "quit": \n) print '
+
+wait
\ No newline at end of file
diff --git a/examples/arithmetic2.modal b/examples/arithmetic2.modal
new file mode 100644
index 0000000..0438471
--- /dev/null
+++ b/examples/arithmetic2.modal
@@ -0,0 +1,158 @@
+<> (-- ?x) ()
+-- ( little endian binary integers )
+
+-- ( constants )
+<> zero ((0 nil))
+<> one ((1 nil))
+<> two ((0 (1 nil)))
+<> three ((1 (1 nil)))
+<> ten ((0 (1 (0 (1 nil)))))
+
+-- ( decimal digit to binary )
+<> (binary 0) ((0 nil))
+<> (binary 1) ((1 nil))
+<> (binary 2) ((0 (1 nil)))
+<> (binary 3) ((1 (1 nil)))
+<> (binary 4) ((0 (0 (1 nil))))
+<> (binary 5) ((1 (0 (1 nil))))
+<> (binary 6) ((0 (1 (1 nil))))
+<> (binary 7) ((1 (1 (1 nil))))
+<> (binary 8) ((0 (0 (0 (1 nil)))))
+<> (binary 9) ((1 (0 (0 (1 nil)))))
+
+-- ( binary to decimal digit )
+<> (decimal (0 nil)) (0)
+<> (decimal (1 nil)) (1)
+<> (decimal (0 (1 nil))) (2)
+<> (decimal (1 (1 nil))) (3)
+<> (decimal (0 (0 (1 nil)))) (4)
+<> (decimal (1 (0 (1 nil)))) (5)
+<> (decimal (0 (1 (1 nil)))) (6)
+<> (decimal (1 (1 (1 nil)))) (7)
+<> (decimal (0 (0 (0 (1 nil))))) (8)
+<> (decimal (1 (0 (0 (1 nil))))) (9)
+
+-- create nil-terminated list
+<> (nilify (?h)) ((?h nil))
+<> (nilify (?h ?t)) ((?h nilify ?t))
+
+-- reverse nil-terminated list
+<> (reverse ?x) (reverse' nil ?x)
+<> (reverse' ?a nil) (?a)
+<> (reverse' ?a (?h ?t)) (reverse' (?h ?a) ?t)
+
+-- ( normalize, remove trailing zeros )
+-- ( currently zero is (0 nil) though arguably it could be nil )
+-- ( that change would require auditing our rules )
+<> (normalize (?h ?t)) ((?h normalize' nil ?t))
+<> (normalize' ?s nil) (nil)
+<> (normalize' ?s (0 ?t)) (normalize' (0 ?s) ?t)
+<> (normalize' nil (1 ?t)) ((1 normalize' nil ?t))
+<> (normalize' (0 ?s) (1 ?t)) ((0 normalize' ?s (1 ?t)))
+
+-- ( to integer )
+<> ((int ?*)) ((sum f (one) g reverse nilify (?*)))
+<> (g nil) (nil)
+<> (g (?h ?t)) ((binary ?h g ?t))
+<> (f (?u) nil) (nil) 
+<> (f (?u) (?h ?t)) (((mul ?h ?u) f ((mul ?u ten)) ?t))
+
+-- ( to string: TODO, need division for this one )
+
+-- ( comparison operartions )
+<> ((cmp ?x ?y)) ((cmpc #eq ?x ?y))
+<> ((cmpc ?e nil nil)) (?e)
+<> ((cmpc ?e (1 ?x) nil)) (#gt)
+<> ((cmpc ?e (0 ?x) nil)) ((cmpc ?e ?x nil))
+<> ((cmpc ?e nil (1 ?y))) (#lt)
+<> ((cmpc ?e nil (0 ?y))) ((cmpc ?e nil ?y))
+<> ((cmpc ?e (0 ?x) (0 ?y))) ((cmpc ?e ?x ?y))
+<> ((cmpc ?e (1 ?x) (0 ?y))) ((cmpc #gt ?x ?y))
+<> ((cmpc ?e (0 ?x) (1 ?y))) ((cmpc #lt ?x ?y))
+<> ((cmpc ?e (1 ?x) (1 ?y))) ((cmpc ?e ?x ?y))
+
+-- ( addition )
+<> ((add ?x ?y)) (addc 0 ?x ?y)
+<> (addc 0 nil nil) (nil)
+<> (addc 1 nil nil) ((1 nil))
+<> (addc ?c ?x nil) (addc ?c ?x (0 nil))
+<> (addc ?c nil ?y) (addc ?c (0 nil) ?y)
+<> (addc 0 (0 ?x) (0 ?y)) ((0 addc 0 ?x ?y))
+<> (addc 0 (0 ?x) (1 ?y)) ((1 addc 0 ?x ?y))
+<> (addc 0 (1 ?x) (0 ?y)) ((1 addc 0 ?x ?y))
+<> (addc 0 (1 ?x) (1 ?y)) ((0 addc 1 ?x ?y))
+<> (addc 1 (0 ?x) (0 ?y)) ((1 addc 0 ?x ?y))
+<> (addc 1 (0 ?x) (1 ?y)) ((0 addc 1 ?x ?y))
+<> (addc 1 (1 ?x) (0 ?y)) ((0 addc 1 ?x ?y))
+<> (addc 1 (1 ?x) (1 ?y)) ((1 addc 1 ?x ?y))
+
+-- ( summation )
+<> ((sum nil)) ((0 nil))
+<> ((sum (?a nil))) (?a)
+<> ((sum (?a (?b ?c)))) ((sum ((add ?a ?b) ?c)))
+
+-- ( multiplication )
+<> ((mul ?x ?y)) (mulc nil ?x ?y)
+<> (mulc ?t nil ?y) ((sum ?t))
+<> (mulc ?t (0 ?x) ?y) (mulc ?t ?x (0 ?y))
+<> (mulc ?t (1 ?x) ?y) (mulc (?y ?t) ?x (0 ?y))
+
+-- ( subtraction )
+<> ((sub ?x ?y)) (normalize subc 0 ?x ?y)
+<> (subc 0 nil nil) (nil)
+<> (subc 1 nil nil) (#err)
+<> (subc 0 ?x nil) (?x)
+<> (subc 1 ?x nil) (subc 1 ?x (0 nil))
+<> (subc ?c nil ?y) (subc ?c (0 nil) ?y)
+<> (subc 0 (0 ?x) (0 ?y)) ((0 subc 0 ?x ?y))
+<> (subc 0 (0 ?x) (1 ?y)) ((1 subc 1 ?x ?y))
+<> (subc 0 (1 ?x) (0 ?y)) ((1 subc 0 ?x ?y))
+<> (subc 0 (1 ?x) (1 ?y)) ((0 subc 0 ?x ?y))
+<> (subc 1 (0 ?x) (0 ?y)) ((1 subc 1 ?x ?y))
+<> (subc 1 (0 ?x) (1 ?y)) ((0 subc 1 ?x ?y))
+<> (subc 1 (1 ?x) (0 ?y)) ((0 subc 0 ?x ?y))
+<> (subc 1 (1 ?x) (1 ?y)) ((1 subc 1 ?x ?y))
+
+-- ( dec )
+<> (dec (0 nil)) (#err)
+<> (dec ?x) (normalize dec' ?x)
+<> (dec' (0 ?t)) ((1 dec' ?t))
+<> (dec' (1 ?t)) ((0 ?t))
+
+-- ( inc )
+<> ((inc nil)) ((1 nil))
+<> ((inc (0 ?t))) ((1 ?t))
+<> ((inc (1 ?t))) ((0 (inc ?t)))
+
+-- ( left shift; lshift x b means x<<b )
+<> ((lshift ?x (0 nil))) (?x)
+<> ((lshift ?x (1 nil))) ((0 ?x))
+<> ((lshift ?x (?h (?a ?b)))) ((lshift (0 ?x) dec (?h (?a ?b))))
+
+-- ( divmod, i.e. quotient and remainder )
+<> ((divmod ?x ?y)) ((divmod1 ?x ?y (cmp ?x ?y)))
+<> ((divmod1 ?x ?y #lt)) (zero)
+<> ((divmod1 ?x ?y #eq)) (one)
+<> ((divmod1 ?x ?y #gt)) ((divmod2 ?x ?y zero (0 ?y)))
+<> ((divmod2 ?x ?y ?s ?m)) ((divmod3 ?x ?y ?s ?m (cmp ?x ?m)))
+<> ((divmod3 ?x ?y ?s ?m #lt)) ((divmod4 ?x ?y ?s zero))
+<> ((divmod3 ?x ?y ?s ?m #eq)) ((divmod4 ?x ?y (inc ?s) zero))
+<> ((divmod3 ?x ?y ?s ?m #gt)) ((divmod2 ?x ?y (inc ?s) (0 ?m)))
+<> ((divmod4 ?x ?y (0 nil) ?d)) (((add ?d one) (sub ?x ?y)))
+<> ((divmod4 ?x ?y ?s ?d)) ((divmod5 (sub ?x (lshift ?y ?s)) ?y dec ?s (add ?d (lshift one ?s))))
+<> ((divmod5 (0 nil) ?y ?s ?d)) ((?d (0 nil)))
+<> ((divmod5 ?x ?y ?s ?d)) ((divmod6 ?x ?y ?s ?d (cmp ?x (lshift ?y ?s))))
+<> ((divmod6 ?x ?y (0 nil) ?d #lt)) ((?d ?x))
+<> ((divmod6 ?x ?y ?s ?d #lt)) ((divmod5 ?x ?y dec ?s ?d))
+<> ((divmod6 ?x ?y ?s ?d #eq)) ((divmod4 ?x ?y ?s ?d))
+<> ((divmod6 ?x ?y ?s ?d #gt)) ((divmod4 ?x ?y ?s ?d))
+
+-- ( floor divison )
+<> ((div ?x ?y)) ((div' (divmod ?x ?y)))
+<> ((div' (?q ?r))) (?q)
+
+-- ( remainder )
+<> ((mod ?x ?y)) ((mod' (divmod ?x ?y)))
+<> ((mod' (?q ?r))) (?r)
+
+(divmod (int 1234567) (int 1357))
\ No newline at end of file
diff --git a/examples/lambda.modal b/examples/lambda.modal
new file mode 100644
index 0000000..6c90efa
--- /dev/null
+++ b/examples/lambda.modal
@@ -0,0 +1 @@
+?((?x ?y) (?y ?x)) foo bar
\ No newline at end of file
diff --git a/examples/map.modal b/examples/map.modal
new file mode 100644
index 0000000..ba064f7
--- /dev/null
+++ b/examples/map.modal
@@ -0,0 +1,8 @@
+<> (foo ?x) (?x)
+<> (map ?x (list ?l)) (map/l map/x ?x ?l)
+<> (map/x ?x (?h ?t)) (?x ?h (map/x ?x ?t))
+<> (map/x ?x (?h)) (map/r (?x ?h))
+<> (?h (map/r ?t)) (?map/r (?h ?t))
+<> (map/l map/r ?l) (list ?l)
+
+map foo (list (1 (2 (3 (4 (5))))))
\ No newline at end of file
diff --git a/examples/tictactoe.modal b/examples/tictactoe.modal
new file mode 100644
index 0000000..d76448b
--- /dev/null
+++ b/examples/tictactoe.modal
@@ -0,0 +1,44 @@
+-- (Tic Tac Toe)
+
+<> (-- ?x) ()
+<> (READ) (?~)
+
+-- (Print)
+
+<> (?: put-str) (?:)
+<> ((?0 ?1 ?2) put-row) (?0 put-str | put-str ?1 put-str | put-str ?2 put-str \n put-str)
+<> ((?a ?b ?c) display) (?a put-row ?b put-row ?c put-row \n put-str (?a ?b ?c))
+
+-- (Validation)
+
+<> (((?x ?x ?x) ?0 ?1) ?x run) (?x victory)
+<> ((?0 (?x ?x ?x) ?1) ?x run) (?x victory)
+<> ((?0 ?1 (?x ?x ?x)) ?x run) (?x victory)
+<> (((?x ?0 ?1) (?x ?2 ?3) (?x ?4 ?5)) ?x run) (?x victory)
+<> (((?0 ?x ?1) (?2 ?x ?3) (?4 ?x ?5)) ?x run) (?x victory)
+<> (((?0 ?1 ?x) (?2 ?3 ?x) (?4 ?5 ?x)) ?x run) (?x victory)
+<> (((?x ?0 ?1) (?2 ?x ?3) (?4 ?5 ?x)) ?x run) (?x victory)
+<> (((?0 ?1 ?x) (?2 ?x ?3) (?x ?4 ?5)) ?x run) (?x victory)
+
+-- (Game)
+
+<> (((?0 ?1 ?2) ?a ?b) ?x 0 0 play) (((?x ?1 ?2) ?a ?b) display ?x run wait)
+<> (((?0 ?1 ?2) ?a ?b) ?x 1 0 play) (((?0 ?x ?2) ?a ?b) display ?x run wait)
+<> (((?0 ?1 ?2) ?a ?b) ?x 2 0 play) (((?0 ?1 ?x) ?a ?b) display ?x run wait)
+<> ((?a (?0 ?1 ?2) ?b) ?x 0 1 play) ((?a (?x ?1 ?2) ?b) display ?x run wait)
+<> ((?a (?0 ?1 ?2) ?b) ?x 1 1 play) ((?a (?0 ?x ?2) ?b) display ?x run wait)
+<> ((?a (?0 ?1 ?2) ?b) ?x 2 1 play) ((?a (?0 ?1 ?x) ?b) display ?x run wait)
+<> ((?a ?b (?0 ?1 ?2)) ?x 0 2 play) ((?a ?b (?x ?1 ?2)) display ?x run wait)
+<> ((?a ?b (?0 ?1 ?2)) ?x 1 2 play) ((?a ?b (?0 ?x ?2)) display ?x run wait)
+<> ((?a ?b (?0 ?1 ?2)) ?x 2 2 play) ((?a ?b (?0 ?1 ?x)) display ?x run wait)
+
+-- (Play)
+
+<> (ready) (display READ play)
+<> (?x run wait) (READ play)
+<> (?x victory) ((?x wins!\n) put-str)
+
+-- (Interface)
+
+(put-str (Input a move, like "X 0 1":\n))
+((- - -) (- - -) (- - -)) ready 
diff --git a/makefile b/makefile
index 297bc15..85aa564 100644
--- a/makefile
+++ b/makefile
@@ -12,7 +12,7 @@ run: all bin/modal
 test: bin/modal-debug bin/modal
 	@ bin/modal -v
 	@ bin/modal-debug examples/test.modal "(arg1) (arg2 (arg3))"
-	@ time bin/modal examples/test.modal "(arg1) (arg2 (arg3))"
+	@ bin/modal examples/test.modal
 install: bin/modal
 	cp bin/modal ~/bin/
 uninstall:
diff --git a/src/modal.c b/src/modal.c
index d5c3adb..63f0ebf 100644
--- a/src/modal.c
+++ b/src/modal.c
@@ -5,14 +5,14 @@ typedef struct {
 	char *a, *b;
 } Rule;
 
-static int direction;
-static Rule rules[0x1000], *rules_ = rules;
+static int dst;
+static Rule rules[0x1000], lambda, *rules_ = rules;
 static char dict[0x8000], *dict_ = dict;
 static char bank_a[0x4000], *prog_ = bank_a;
 static char bank_b[0x4000], *outp_ = bank_b;
 static char *regs[0x100];
 
-#define spacer(c) (c < 0x21 || c == '(' || c == ')')
+#define spacer(c) (c <= ' ' || c == '(' || c == ')')
 
 static char *
 walk(char *s)
@@ -34,21 +34,17 @@ static char *
 plode(char *s)
 {
 	int i, depth = 0;
-	char c;
-	if(s[0] == '(') { /* implode */
-		while((c = *s++)) {
-			if(c == '(') depth++;
+	char c, *ss;
+	/* implode */
+	if(s[0] == '(') {
+		ss = walk(s);
+		while(s < ss && (c = *s++))
 			if(!spacer(c)) *outp_++ = c;
-			if(c == ')') --depth;
-			if(!depth) return s;
-		}
-	} else { /* explode */
-		*outp_++ = *s++;
-		if(!spacer(*s)) *outp_++ = ' ';
-		while((c = *s++) && !spacer(c)) {
-			*outp_++ = '(', *outp_++ = c, depth++, c = *s;
-			if(!spacer(c)) *outp_++ = ' ';
-		}
+	}
+	/* explode */
+	else {
+		while((c = *s++) && !spacer(c))
+			*outp_++ = c, *outp_++ = ' ', *outp_++ = '(', depth++;
 		for(i = 0; i < depth; i++)
 			*outp_++ = ')';
 	}
@@ -67,7 +63,7 @@ set_reg(int r, char *b)
 	return 1;
 }
 
-static int
+static void
 put_reg(char r)
 {
 	char *s = regs[(int)r];
@@ -82,19 +78,18 @@ put_reg(char r)
 		if(r == ':') {
 			if(*s == '(') s++, --ss;
 			while(s < ss) {
-				char c = *(s++);
-				if(c == '\\' && *(s++) == 'n') c = 0xa;
+				char c = *s++;
+				if(c == '\\' && *s++ == 'n') c = 0xa;
 				putc(c, stdout);
 			}
 		} else
-			while((s < ss)) *outp_++ = *s++;
+			while(s < ss) *outp_++ = *s++;
 	} else
 		*outp_++ = r;
-	return 1;
 }
 
 static char *
-match_rule(char *p, Rule *r)
+match_rule(Rule *r, char *p)
 {
 	int i;
 	char c, *a = r->a, *b = p;
@@ -119,7 +114,7 @@ commit_rule(Rule *r, char *s, int create)
 	while((*outp_++ = *s++))
 		;
 	*outp_++ = 0;
-	if((direction = !direction))
+	if((dst = !dst))
 		prog_ = bank_b, outp_ = bank_a;
 	else
 		prog_ = bank_a, outp_ = bank_b;
@@ -130,24 +125,12 @@ commit_rule(Rule *r, char *s, int create)
 	return 1;
 }
 
-static char *
-parse_frag(char *s)
-{
-	char c, *ss;
-	while((c = *s) && c <= ' ') s++;
-	ss = walk(s);
-	if(*s == '(') s++, ss--;
-	while((s < ss)) *dict_++ = *s++;
-	*dict_++ = 0;
-	s++;
-	return s;
-}
-
 static int
-write(Rule *r, char last, char *res){
+write_rule(Rule *r, char last, char *res)
+{
 	char cc, *b = r->b;
 	if(!*b && last == ' ') outp_--;
-	while((cc = *b++)) 
+	while((cc = *b++))
 		if(cc == '?')
 			put_reg(*b++);
 		else
@@ -155,34 +138,55 @@ write(Rule *r, char last, char *res){
 	return commit_rule(r, res, 0);
 }
 
+static char *
+parse_frag(char *s)
+{
+	char c, *ss;
+	while((c = *s) && c <= ' ') s++;
+	ss = walk(s);
+	if(*s == '(') s++, ss--;
+	while(s < ss) *dict_++ = *s++;
+	*dict_++ = 0;
+	s++;
+	return s;
+}
+
+static char *
+create_rule(Rule *r, int id, char *s)
+{
+	char c;
+	r->id = id, s += 2;
+	r->a = dict_, s = parse_frag(s), r->b = dict_, s = parse_frag(s);
+	while((c = *s) && c <= ' ') s++;
+	return s;
+}
+
 static int
 rewrite(void)
 {
-	char c, last = 0, *p = direction ? bank_b : bank_a, *res;
-	while((c = *p) && c <= ' ') p++;
-	while((c = *p)) {
+	char c, last = 0, *cap, *s = dst ? bank_b : bank_a, *res;
+	while((c = *s) && c <= ' ') s++;
+	while((c = *s)) {
 		if(spacer(last)) {
-			Rule *r = NULL, lambda;
-			if(p[0] == '<' && p[1] == '>') {
+			Rule *r;
+			if(s[0] == '<' && s[1] == '>') {
 				r = rules_++;
-				r->id = rules_ - rules - 1;
-				p += 2, r->a = dict_, p = parse_frag(p), r->b = dict_, p = parse_frag(p);
-				return commit_rule(r, p, 1);
+				s = create_rule(r, rules_ - rules - 1, s);
+				return commit_rule(r, s, 1);
 			}
-			if(p[0] == '?' && p[1] == '(') {
-				r = &lambda;
-				p += 2, r->a = dict_, p = parse_frag(p), r->b = dict_, p = parse_frag(p);
-				p++;
-				while((c = *p) && c <= ' ') p++;
-				if((res = match_rule(p, r)) != NULL) 
-					return write(r, last, res);
+			if(s[0] == '?' && s[1] == '(') {
+				r = &lambda, cap = walk(s + 1);
+				create_rule(&lambda, -1, s), s = cap;
+				while((c = *s) && c <= ' ') s++;
+				if((res = match_rule(&lambda, s)) != NULL)
+					return write_rule(&lambda, last, res);
 			}
-			for(r = rules; r < rules_; r++) 
-				if((res = match_rule(p, r)) != NULL) 
-					return write(r, last, res);
+			for(r = rules; r < rules_; r++)
+				if((res = match_rule(r, s)) != NULL)
+					return write_rule(r, last, res);
 		}
 		*outp_++ = last = c;
-		p++;
+		s++;
 	}
 	*outp_++ = 0;
 	return 0;
@@ -196,7 +200,7 @@ main(int argc, char **argv)
 	if(argc < 2)
 		return !printf("usage: modal [-v] source.modal\n");
 	if(argc < 3 && argv[1][0] == '-' && argv[1][1] == 'v')
-		return !printf("Modal Interpreter, 10 Apr 2024.\n");
+		return !printf("Modal Interpreter, 11 Apr 2024.\n");
 	if(!(f = fopen(argv[1], "r")))
 		return !printf("Invalid Modal file: %s.\n", argv[1]);
 	while(fread(&c, 1, 1, f)) {