s" , " $cat
bdate2human $cat encode-string THEN
;
+
+: invert-region ( addr len -- )
+ 2dup or 7 and CASE
+ 0 OF 3 rshift 0 ?DO dup dup rx@ -1 xor swap rx! xa1+ LOOP ENDOF
+ 4 OF 2 rshift 0 ?DO dup dup rl@ -1 xor swap rl! la1+ LOOP ENDOF
+ 3 and
+ 2 OF 1 rshift 0 ?DO dup dup rw@ -1 xor swap rw! wa1+ LOOP ENDOF
+ dup OF 0 ?DO dup dup rb@ -1 xor swap rb! 1+ LOOP ENDOF
+ ENDCASE
+ drop
+;