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while (EXPR) {
    REDO:
...
    #body of next block
}
LAST:

 
NEXT: while (EXPR) {
    REDO:
    # body of while block
}
LAST:

# nb this is stupid code that shortens lines (a char at a time)
# and prints the result, until it finds a z at the first pos.
...
    }
}
print "done";