The key idea [of this paper] is that [sequence] values are not sequences or references to positions in sequences, … new functions-- base, start, next, and extent--which map … defining search functions, and shows how it can … [p. 475] A subsequence reference or subseq is a … [b,l,r] … [start is the subsequence [b,l,l], base is the subsequence for all of b, next is … [b,r,r+1] … of y.
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