(?:(?{local $q [0] = $nodes [0]})| (?{local $q [0] = $nodes [1]})| (?{local $q [0] = $nodes [2]})| (?{local $q [0] = $nodes [3]})| (?{local $q [0] = $nodes [4]})| (?{local $q [0] = $nodes [5]})| (?{local $q [0] = $nodes [6]})| (?{local $q [0] = $nodes [7]})) (?:(?{local $q [1] = $nodes [0]})| (?{local $q [1] = $nodes [1]})| (?{local $q [1] = $nodes [2]})| (?{local $q [1] = $nodes [3]})| (?{local $q [1] = $nodes [4]})| (?{local $q [1] = $nodes [5]})| (?{local $q [1] = $nodes [6]})| (?{local $q [1] = $nodes [7]})) (?(?{$q [1] eq $q [0] || !$graph {$q [0]} {$q [1]}})x|)