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147 five letter words begin with TO, and the third box is spread across more letters than most two letter openings manage.
R leads at about fifteen percent, P at thirteen and N at ten. U, L and W each take six or seven, and nothing else reaches five.
TODAY, TOTAL, TOOLS, TOPIC and TOUCH are the most common entries, and they reach five different third letters between them.
TOOLS, TOOTH and TOOTS put a second O straight after the first. It is a small shape but a distinctive one, and a repeated O confirms it outright.
TOUCH is the best single opener. Its U, C and H reach three separate branches and none of its letters repeats.
TODAY. TOTAL repeats its T, which wastes a box, while TODAY tests five distinct letters across four branches.
TOWER, TOWNS and TOWEL among others. It is small at six percent but every word on it is in common use.
Its X appears in almost nothing else here, so it is a poor opener but it settles the question immediately if an X turns up.