 In set theory notation, these are [0,1,4,6] (4-Z15) and [0,1,3,7] (4-Z29).Their inversions are [0,2,5,6] (4-Z15b) and [0,4,6,7] (4-Z29b).The interval vector for all all-interval tetrachords is [1,1,1,1,1,1].