an implementation of Lindenmayer systems (also called L-systems, substitution systems).
A simple implementation of Lindenmayer systems (also called L-systems, substitution systems) is provided. In basic form, a Lindenmayer system consists of a starting string of symbols from an alphabet, and has repeated transitions applied to it, specified by a list of transition search-and-replace rules. In addition to the standard formulation, two alternative implementations are included: sequential systems, in which at most one rule is applied; and tag systems, in which the transition only takes place at the beginning and end of the string.
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