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List digital$\_$data is read from input. The elements of digital$\_$data are separated into quarters. The first, second, third, and fourth

quarters of the digital data are samples collected from four stages of a transmission process, respectively. Integer slice$\_$length

represents the number of samples in each stage.

Assign slice$\_$length with len$($digital$\_$data$)//4.$

Assign data$\_$stage$1$ with a slice of digital$\_$data from the beginning up to and excluding index slice$\_$length.

Assign data$\_$stage$2$ with a slice of digital$\_$data from index slice$\_$length up to and excluding index $(2*$ slice$\_$length$).$

Assign data$\_$stage$3$ with a slice of digital$\_$data from index $(2*$ slice$\_$length$)$ up to and excluding index $(3*$ slice$\_$length$).$

Assign data$\_$stage$4$ with a slice of digital$\_$data from index $(3*$ slice$\_$length$)$ up to and including the end.

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