1*a7c91847SchristosHere is a comparison matrix which shows a case in which 2*a7c91847Schristosit is possible for the forward and backward scan in `diag' 3*a7c91847Schristosto meet along a nonzero length of diagonal simultaneous 4*a7c91847Schristos(so that bdiag[d] and fdiag[d] are not equal) 5*a7c91847Schristoseven though there is no snake on that diagonal at the meeting point. 6*a7c91847Schristos 7*a7c91847Schristos 8*a7c91847Schristos 85 1 1 1 159 1 1 17 9*a7c91847Schristos 1 2 3 4 10*a7c91847Schristos60 11*a7c91847Schristos 1 2 12*a7c91847Schristos1 13*a7c91847Schristos 2 2 3 4 14*a7c91847Schristos71 15*a7c91847Schristos 3 3 4 5 16*a7c91847Schristos85 17*a7c91847Schristos 4 3 4 5 18*a7c91847Schristos17 19*a7c91847Schristos 5 4 5 20*a7c91847Schristos1 21*a7c91847Schristos 6 4 5 6 22*a7c91847Schristos183 23*a7c91847Schristos 7 5 6 7 24*a7c91847Schristos10 25*a7c91847Schristos 8 6 7 26*a7c91847Schristos1 27*a7c91847Schristos 9 6 7 8 28*a7c91847Schristos12 29*a7c91847Schristos 7 8 9 10 30*a7c91847Schristos13 31*a7c91847Schristos 10 8 9 10 32*a7c91847Schristos14 33*a7c91847Schristos 10 9 10 34*a7c91847Schristos17 35*a7c91847Schristos 10 10 36*a7c91847Schristos1 37*a7c91847Schristos 10 9 10 38*a7c91847Schristos1 39*a7c91847Schristos 8 10 10 10 40*a7c91847Schristos183 41*a7c91847Schristos 8 7 9 9 9 42*a7c91847Schristos10 43*a7c91847Schristos 7 6 8 9 8 8 44*a7c91847Schristos1 45*a7c91847Schristos 6 5 7 7 46*a7c91847Schristos1 47*a7c91847Schristos 5 6 6 48*a7c91847Schristos1 49*a7c91847Schristos 5 5 5 50*a7c91847Schristos50 51*a7c91847Schristos 5 4 4 4 52*a7c91847Schristos1 53*a7c91847Schristos 4 3 3 54*a7c91847Schristos85 55*a7c91847Schristos 5 4 3 2 2 56*a7c91847Schristos1 57*a7c91847Schristos 2 1 58*a7c91847Schristos17 59*a7c91847Schristos 5 4 3 2 1 1 60*a7c91847Schristos1 61*a7c91847Schristos 1 0 62*a7c91847Schristos 85 1 1 1 159 1 1 17 63*a7c91847Schristos 64*a7c91847Schristos 65*a7c91847Schristos 66*a7c91847Schristos 67*a7c91847Schristos 68*a7c91847Schristos 69*a7c91847Schristos 70*a7c91847Schristos 71*a7c91847Schristos 72