As we discussed in that meeting, here's the code snippet I was thinking about to generate the binary strings:
print map "$_\n", strings_for(6, 4);
sub strings_for {
my ($cats, $cols) = @_;
$cats--; $cols--;
my @ret;
for (0..(1 << $cats) - 1) {
my $bitstring = substr(unpack("B*", pack "N", $_), -$cats);
next unless $bitstring =~ tr/1// == $cols;
push @ret, $bitstring;
}
@ret;
}
-- Randal L. Schwartz, Perl hacker
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