Ai! Lá polin saca i quettar!
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The usual Quenya word for “seven” was otso dating all the way back to the Qenya Lexicon of the 1910s (PE17/96; VT47/42; VT48/6; Ety/OT; PE14/49, 82; QL/71), though it had occasional variants like otos (PE17/95) or {oxo >>} osko (VT47/42). Its root form was √OTOS or √OTOK, the latter producing S. odog “seven”.