$atten = build_pad(10);
$atten->dump("PAD 10dB");

my $atten2 = build_pad(20);
$atten2->dump("PAD 20dB");

$term = build_impedance(50);
$term->dump("TERM 50ohm");

$g = $atten2->attach($term, [qw( out_pos in_pos )], [qw( out_neg in_neg )]);
delete $g->{nodes}{out_neg};
delete $g->{nodes}{out_pos};
$g->dump("PAD 20dB + TERM 50ohm");

$h = $atten->attach($atten2, [qw( out_pos in_pos )], [qw( out_neg in_neg )]);
delete $h->{nodes}{out_neg};
delete $h->{nodes}{out_pos};
$h->dump("PAD 10dB + PAD 20dB + TERM 50ohm");

my $i = $h->simplify();
$i->dump("RESULT!");