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.
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