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my $i = my $x = (split(/\./, '205.0.0.0'))[0];
my $j = my $y = (split(/\./, '123.0.0.0'))[0];
...

print("$i & $j = $ij\n");  # 205 & 123 = 001
print("$x & $y = $xy\n");  # 205 & 123 = 73