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Use P. αὐλός, ὁ.
furrow: Ar. and P. ὁλκός, ὁ (Xen.), Ar. and V. ἄλοξ, ἡ.
war least of all moves in a groove: P. ἥκιστα πόλεμος ἐπὶ ῥητοῖς χωρεῖ (Thuc. 1, 122).