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    #!/usr/bin/perl
use strict;
...

place(0) or warn "paving failed\n";
display();
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    +----+-+----+--+-+----+-+--+---+---+---+--+-+---+--+-+---+--+ 
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+----+-----+-----+---+---+-+--+-+-+-+--+--+-+-+-+-+-+---+-+-+