Here goes my test for your suggestion:
Benchmark: timing 3 iterations of 20.two_string, 30.two_string_lookahe
20.two_string: 236 wallclock secs (234.31 usr + 1.62 sys = 235.93 CPU
+) @ 0.01/s (n=3)
30.two_string_lookahead: 178 wallclock secs (176.23 usr + 1.52 sys =
+177.75 CPU) @ 0.02/s (n=3)
So it's better, but still not linear ...
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