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Hands and feet of four-character idioms and mathematics
1. Four words about mathematics, wholeheartedly, divided into two, no three no four (half-hearted), in all directions, extending in all directions, colorful (colorful), distracted, scattered, changeable, half a catty, nine Niu Yi hairs, narrow escape, the power of the skylight.

(2) Perfection (urgency), letting a hundred flowers blossom (a hundred schools of thought contend), hordes of troops (once in a blue moon) and colorful (Qianshan).

One eye and ten lines, the difference of one thought, one word, one word, one teacher, is quite critical, have a good trip, kill two birds with one stone, one heart, three long and two short, extending in all directions, colorful and colorful.