公式： f(x)=x⋅σ(x)
// 比较函数（便于统计比较次数，可选）
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self.sleep_min = 0.2
After producing several hits through the early 1960s, he later returned to Billboard's Top 10 chart in 1975 after writing the song Love Will Keep Us Together for duo Captain & Tennille. He also recorded several albums for Elton John's record label in the 1970s.