R version 2.11.1 (2010-05-31)
Copyright (C) 2010 The R Foundation for Statistical Computing
ISBN 3-900051-07-0

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> x <- c(442,441,440,438,458,457,442,432,433,433,434,436,439,439,441,436,460,453,435,421,412,408,402,409,410,410,416,410,437,431,411,398,394,395,389,404,397,401,402,383,406,400,377,372,362,365,361,372,355,365,367,341,370,366,333,320,298,306,293,313,293,304,304,286,320,313,283,272,251,262,247,268,251,257,261,242,274,272,243,234,217,231,209,226,208,214,222,194,230,226,197,188,175,190,165,176,159,169,170,141,170,164,132,123,113,125,101,99,87,90,89,66,102,97,65,54,33,49,30,34)
> par4 = '12'
> par3 = 'Cijfers jan '00-dec'09'
Error: unexpected numeric constant in "par3 = 'Cijfers jan '00"
Execution halted