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a. ӛסһԭtи һ ҊгF(xin)(ǶγF(xin))xֳF(xin)@x헄tܿǴeҪעfԒ˽(jng)؏͵PI~
b. иLԒnÌWgvƫؿ鿼'w⡢@䌍ģMУnáƽrrؾ}ĿČceҲҪһ] Ć~MrgµҪ^chA^õĿƽrԳ ӢZVӖԇZʹ Ҳ]PϵھµĿw˼
c. гF(xin)ıʾԭD۵߉Pϵ(jng)ɞ鿼c гF(xin)ʾԭPI~磺becausebecause ofthe main reasonsince߱ʾD۵PI~buthoweverҪeע
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