diff --git a/projects/examples/exercises/primes.tal b/projects/examples/exercises/primes.tal
index 7c95e24..3910102 100644
--- a/projects/examples/exercises/primes.tal
+++ b/projects/examples/exercises/primes.tal
@@ -6,34 +6,31 @@
 
 	#0000 INC2k
 	&loop
-		DUP2 ,is-prime JSR #00 EQU ,&skip JCN
-			( print ) DUP2 ,print/short JSR
-			( space ) #2018 DEO
+		DUP2 not-prime ?&skip
+			DUP2 print/short #2018 DEO
 			&skip
-		INC2 NEQ2k ,&loop JCN
+		INC2 NEQ2k ?&loop
 	POP2 POP2
 	( halt ) #010f DEO
-	
+
 BRK
 
-@is-prime ( number* -- flag )
+@not-prime ( number* -- flag )
 
 	DUP2 ,&t STR2
-	( range ) #01 SFT2 #0002 LTH2k ,&fail JCN
+	( range ) #01 SFT2 #0002 LTH2k ?&fail
 	&loop
-		[ LIT2 &t $2 ] OVR2
-			( mod2 ) DIV2k MUL2 SUB2
-			ORA #00 EQU ,&fail JCN
-		INC2 GTH2k ,&loop JCN
-	POP2 POP2 #01
+		[ LIT2 &t $2 ] OVR2 ( mod2 ) DIV2k MUL2 SUB2 ORA ?&continue
+			&fail POP2 POP2 #01 JMP2r &continue
+		INC2 GTH2k ?&loop
+	POP2 POP2 #00
 
 JMP2r
-	&fail POP2 POP2 #00 JMP2r
 
 @print ( short* -- )
 
-	&short ( short* -- ) SWP ,&byte JSR
-	&byte ( byte -- ) DUP #04 SFT ,&char JSR
+	&short ( short* -- ) SWP print/byte
+	&byte ( byte -- ) DUP #04 SFT print/char
 	&char ( char -- ) #0f AND DUP #09 GTH #27 MUL ADD #30 ADD #18 DEO
 
 JMP2r