Excess Coverage Arrays and Levenshtein's Conjecture

Amber E. Gentle, Daniel Horsley, Ian M. Wanless

A sequence covering array, denoted \textsf{SCA}$(N;t,v)$, is a set of $N$ permutations of $\{0,\dots ,v-1\}$ such that each sequence of $t$ distinct elements of $\{0, \dots, v-1\…