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145 five letter words start with AR, and no third letter takes more than about one in eight.
A leads at about thirteen percent, E at twelve, and I and G at ten each. R and T take eight apiece.
AREAS, ARRAY, ARENA, ARMED and ARROW are the most common entries, and they cover five different third letters.
ARRAY and ARROW both double the R straight after the opening pair, and AREAS repeats its A. That makes a repeated letter unusually likely here.
ARISE is the most informative opener. Its I, S and E are three of the commonest letters at this length and none of them repeats.
AR opens a wide set of unrelated roots rather than one productive family, so nothing accumulates behind a single letter.
Both confirm the doubled R, so landing either one tells you the shape immediately even when the ending is wrong.
Its G and U reach a branch that the commoner entries miss, which makes it a reasonable second move rather than a first.