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changed to accommodate the program).
start from the end of the text (below), and as you move left, you will encounter a lot of “possible matches” that are waiting for confirmation. all the heavy computation has already been done in the states of the automaton, which are reused for subsequent characters, so after initial wind-up time, you will not create any new states, just reusing the same ones over and over again, and marking the positions of matches as you go.