giles
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Classic distinct-subsequences 2D DP: dp[i][j] = dp[i-1][j] + (s[i-1] = t[j-1] ? dp[i-1][j-1] : 0) dp[i][0] = 1 (empty t is a subseq of any prefix of s) count_subseq "rabbbit" "rabbit" = 3 The three witnesses correspond to which 'b' in "rabbbit" is dropped (positions 2, 3, or 4 zero-indexed of the run of bs). Complements subseq_check.ml (just tests presence); this one counts distinct embeddings. Tests 2D DP with Array.init n (fun _ -> Array.make m 0), base row initialization, mixed string + array indexing. 175 baseline programs total.