(a) the wrong order loses the path entirely:
  k outermost (correct):
        0     3     2     1
      inf     0   inf   inf
      inf     1     0   inf
      inf     2     1     0
  i outermost, k innermost (wrong):
        0   inf     2     1
      inf     0   inf   inf
      inf     1     0   inf
      inf     2     1     0
  the two agree: NO
  delta(1,2): correct = 3, wrong = inf (no path found at all)
  passes of the wrong order needed before it matches: 2

(b) the wrong order finds a path, but overcharges:
  k outermost (correct):
        0    10     9     6
      inf     0   inf   inf
      inf     1     0   inf
      inf     4     3     0
  i outermost, k innermost (wrong):
        0    12     9     6
      inf     0   inf   inf
      inf     1     0   inf
      inf     4     3     0
  the two agree: NO
  delta(1,2): correct = 10, wrong = 12
  passes of the wrong order needed before it matches: 2
