marked occurrence

See: event
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u] on U where the length of a cluster is marked by the formal variable z and each marked occurrence of [u.
A text where some occurrences of words from U are marked is decomposed combinatorically as a sequence of letters from ,A and clusters (set of overlapping and marked occurrences of U, noted [L.
u the number of marked occurrences of the word a in the cluster, i.