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L-system
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== Open problems == There are many open problems involving studies of L-systems. For example: * Characterisation of all the deterministic context-free L-systems which are [[locally catenative sequence|locally catenative]]. (A complete solution is known only in the case where there are only two variables).<ref>{{Cite book | doi=10.1007/978-3-642-59136-5_5|chapter = L Systems|title = Handbook of Formal Languages| pages=253β328|year = 1997|last1 = Kari|first1 = Lila| last2=Rozenberg| first2=Grzegorz| last3=Salomaa| first3=Arto| isbn=978-3-642-63863-3}}</ref>
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