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