Quote Originally Posted by ss-kalm View Post
You can't go past your starting point ... So in effect you have a run of 26 letters in alphabetical order from your starting point. So in this case TUVWXYZABCDEFGHIJKLMNOPQRS ... So from the T you can progress to H, but then NOT back to E, so what Acorn is saying is that the H blocked you from the following E.

If you can go round as many times as you like there is no word that you cannot construct.
just to expound on Keith's explanation -

last valid word used was SAD so next word needs to start with "D" (the last letter of the last valid word). so moving left to right one letter at a time...

DEFGHIJKLMNOPQRSTUVWXYZABC.

DENY

next word must start with "Y" and then the next 25 letters one at a time, proceeding left to right until you reach the end of the line - YZABCDEFGHIJKLMNOPQRSTUVWX.