一番のりいちばんのり

first rider in a charge

千番に一番の兼合せんばんにいちばんのかねあい

something so difficult that one doesn't know if there's even a 1 in 1000 chance of success

千番に一番の兼ね合いせんばんにいちばんのかねあい

something so difficult that one doesn't know if there's even a 1 in 1000 chance of success

分の一ぶんのいち

one Nth part (e.g. one fifth, one tenth); one out of N

一の位いちのくらい

unit digit

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