Permutation fugue

Choir fugue without free intermezzos in which unaltered counterpoints, alternating as dux and comes, follow each other according to a fixed scheme: 
             A B A B A B A B

soprano      1 2 3 4 1 2 3 4
alto           1 2 3 4 1 2 3   
tenore           1 2 3 4 1 2 
basso              1 2 3 4 1

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