change lines 5+6 to my %A; my @order=qw/horse lion mule tiger/;

Keywords to check are: soft references and auto-vivification: your strings 'a' to 'd' can be abused as soft references, which happens without use strict. With use strict however, you need a real hash-ref in the elements of %A instead - see perlreftut for more on references and soft references. Or omit the initialization of your hash-of-hashes %A to autovivify any undef values automagically as required (Autovivify definition or again: perlreftut).

and for your aligning your table layout, consider something like sprintf "%5s", $stringvariable

cu & HTH, Peter -- hints may be untested unless stated otherwise; use with caution & understanding.

In reply to Re^4: create a matrix for print 0 or 1 from pairing by jakobi
in thread create a matrix for print 0 or 1 from pairing by vis1982

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