What changes at every step
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Step 1REVS -> REDS
Tile 3 changes V to D; the move is sideways by letter shape. REDS has 12 legal neighbors, 2 shortest continuations, and 5 moves remaining. Other legal exits from REVS include REGS, REPS, REFS, RECS.
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Step 2REDS -> RODS
Tile 2 changes E to O; the move is closer by letter shape. RODS has 16 legal neighbors, 2 shortest continuations, and 4 moves remaining. Other legal exits from REDS include BEDS, REGS, MEDS, WEDS.
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Step 3RODS -> CODS
Tile 1 changes R to C; the move is sideways by letter shape. CODS has 17 legal neighbors, 1 shortest continuation, and 3 moves remaining. Other legal exits from RODS include BODS, ROWS, GODS, MODS.
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Step 4CODS -> COOS
Tile 3 changes D 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 CODS include CONS, COPS, COWS, COTS.
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Step 5COOS -> 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 6COOP -> 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.