Thanks Quisling, but I have given up on this. The gridfill was tortuous but the preamble is definitely very unhelpful. The "graphically not physically" could mean anything and the survivor could be any number of letters ( at least 7+), additionally the use of characters twice is, I think, very misleading. After 3 days of torment, bring back the hare is what I say (and I truly believe that I would never say that).