Question

讘转专讙讬诇 讛讻驻诇 讛讘讗 讻诇 讗讜转 诪讬讬爪讙转 住驻专讛: `诪讬 times 讚诇讬 = 诪讬讬诐`. 讗讜转讬讜转 讝讛讜转 诪讬讬爪讙讜转 住驻专讜转 讝讛讜转 讜讗讜转讬讜转 砖讜谞讜转 - 住驻专讜转 砖讜谞讜转. 诪住驻专 诇讗 讬讻讜诇 诇讛转讞讬诇 讘-`0`. 诪爪讗讜 讗转 讻诇 讛讗驻砖专讜讬讜转 注讘讜专 讛讙讜专诐 `讚诇讬`.

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