What changes at every step
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Step 1TINS -> TONS
Tile 2 changes I to O; the move is closer by letter shape. TONS has 21 legal neighbors, 1 shortest continuation, and 4 moves remaining. Other legal exits from TINS include TIPS, TITS, PINS, SINS.
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Step 2TONS -> CONS
Tile 1 changes T to C; the move is sideways by letter shape. CONS has 19 legal neighbors, 1 shortest continuation, and 3 moves remaining. Other legal exits from TONS include TOYS, TONE, SONS, TOPS.
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Step 3CONS -> COOS
Tile 3 changes N to O; the move is closer by letter shape. COOS has 15 legal neighbors, 1 shortest continuation, and 2 moves remaining. Other legal exits from CONS include COPS, COWS, COTS, COGS.
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Step 4COOS -> COOP
Tile 4 changes S to P; the move is closer by letter shape. COOP has 14 legal neighbors, 1 shortest continuation, and 1 move remaining. Other legal exits from COOS include COOL, COOK, BOOS, COOT.
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Step 5COOP -> POOP
Tile 1 changes C to P; the move is closer by letter shape. POOP has 11 legal neighbors, target reached, and 0 moves remaining. Other legal exits from COOP include LOOP, HOOP, BOOP, GOOP.