What changes at every step
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Step 1WARN -> WORN
Tile 2 changes A to O; the move is closer by letter shape. WORN has 12 legal neighbors, 1 shortest continuation, and 4 moves remaining. Other legal exits from WARN include BARN, EARN, WARD, WARE.
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Step 2WORN -> BORN
Tile 1 changes W to B; the move is sideways by letter shape. BORN has 11 legal neighbors, 1 shortest continuation, and 3 moves remaining. Other legal exits from WORN include WORK, PORN, WORD, CORN.
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Step 3BORN -> BOON
Tile 3 changes R to O; the move is closer by letter shape. BOON has 14 legal neighbors, 1 shortest continuation, and 2 moves remaining. Other legal exits from BORN include PORN, BURN, CORN, HORN.
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Step 4BOON -> BOOP
Tile 4 changes N to P; the move is closer by letter shape. BOOP has 12 legal neighbors, 1 shortest continuation, and 1 move remaining. Other legal exits from BOON include BOOK, BOOT, BOOB, BOOM.
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Step 5BOOP -> POOP
Tile 1 changes B to P; the move is closer by letter shape. POOP has 11 legal neighbors, target reached, and 0 moves remaining. Other legal exits from BOOP include LOOP, COOP, HOOP, GOOP.