R version 2.9.0 (2009-04-17)
Copyright (C) 2009 The R Foundation for Statistical Computing
ISBN 3-900051-07-0

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> x <- c(568,567,566,564,584,583,568,558,559,559,560,562,563,552,552,555,575,567,548,541,544,546,551,550,546,532,523,528,555,543,525,517,519,521,520,516,509,494,484,482,508,500,480,467,471,482,481,477,471,455,441,434,459,448,432,414,415,423,425,427,415,399,386,377,397,379,361,350,348,363,367,365,354,327,312,307,335,317,298,286,288,303,310,301,293,264,255,251,279,253,233,226,232,245,250,242,230,196,188,181,212,186,166,155,157,173,182,182,168,131,114,106,134,103,83,74,83,96,95,100)
> par4 = '12'
> par3 = 'aantal auto's verkocht per maand'
Error: unexpected symbol in "par3 = 'aantal auto's"
Execution halted