R version 2.8.0 (2008-10-20)
Copyright (C) 2008 The R Foundation for Statistical Computing
ISBN 3-900051-07-0

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> x <- c(jan-00	41086,feb-00	39690,mrt-00	43129,apr-00	37863,mei-00	35953,jun-00	29133,jul-00	24693,aug-00	22205,sep-00	21725,okt-00	27192,nov-00	21790,dec-00	13253,jan-01	37702,feb-01	30364,mrt-01	32609,apr-01	30212,mei-01	29965,jun-01	28352,jul-01	25814,aug-01	22414,sep-01	20506,okt-01	28806,nov-01	22228,dec-01	13971,jan-02	36845,feb-02	35338,mrt-02	35022,apr-02	34777,mei-02	26887,jun-02	23970,jul-02	22780,aug-02	17351,sep-02	21382,okt-02	24561,nov-02	17409,dec-02	11514,jan-03	31514,feb-03	27071,mrt-03	29462,apr-03	26105,mei-03	22397,jun-03	23843,jul-03	21705,aug-03	18089,sep-03	20764,okt-03	25316,nov-03	17704,dec-03	15548,jan-04	28029,feb-04	29383,mrt-04	36438,apr-04	32034,mei-04	22679,jun-04	24319,jul-04	18004,aug-04	17537,sep-04	20366,okt-04	22782,nov-04	19169,dec-04	13807,jan-05	29743,feb-05	25591,mrt-05	29096,apr-05	26482,mei-05	22405,jun-05	27044,jul-05	17970,aug-05	18730,sep-05	19684,okt-05	19785,nov-05	18479,dec-05	10698)
Error: unexpected numeric constant in "x <- c(jan-00	41086"
Execution halted