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@inproceedings{COLC07, address = {Berlin, Heidelberg}, author = {Colcombet, Thomas}, booktitle = {Automata, Languages and Programming}, editor = {Arge, Lars and Cachin, Christian and Jurdziński, Tomasz and Tarlecki, Andrzej}, isbn = {978-3-540-73420-8}, pages = {901--912}, publisher = {Springer Berlin Heidelberg}, sha256 = {F9F803566167FC8D36903104A7E9C242A8DDF48F18695ECB9D02B194490B8D5B}, title = {A Combinatorial Theorem for Trees}, year = {2007} }