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+define decrement
+ dup $decrement_var !
+ @ 1 - $decrement_var @ !
+ $decrement_var forget ;
+
+10 $idx !
+[ $idx @ dup 0 gt? ] -- while idx > 0
+ [ 2 mod 0 eq? -- print "even" if even, "odd" if odd
+ [ "even" s. ]
+ [ "odd" s. ] cond
+ $idx decrement ] loop -- decrement idx by 1
+drop