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We present a combinatorial method of constructing solutions to the normalordering of boson operators. Generalizations of standard combinatorial notions- the Stirling and Bell numbers, Bell polynomials and Dobinski relations - leadto calculational tools which allow to find explicitly normally ordered formsfor a large class of operator functions.Comment: Presented at 14th Int. Colloquium on Integrable Systems, Prague,  Czech Republic, 16-18 June 2005. 6 pages, 11 reference

Combinatorial solutions to normal ordering of bosons