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[ while X (slot 0) is not 0
   >> move to Z (slot 2)
   [ loop sets Z to 0
...
      -
   ]
]

> point to slot 1
[
...
   Y >= X, do whatever here
   < point to slot 4, always zero to terminate the loop
]

#include <stdio.h>
#include <stdlib.h>
...
    }
   return 0;
 }