0001047469-07-007636 SC 13G 2 20071015 20071015 CDW CORP 0000899171 5961 363310735 IL 1231 SC 13G 34 005-49213 071172115 200 N MILWAUKEE AVE VERNON HILLS IL 60061 8474656000 200 N MILWAUKEE AVE VERNON HILLS IL 60061 CDW COMPUTER CENTERS INC 19930322 CITIGROUP INC 0000831001 6021 521568099 DE 1231 SC 13G 399 PARK AVENUE NEW YORK NY 10043 2125591000 399 PARK AVENUE NEW YORK NY 10043 TRAVELERS GROUP INC 19950519 TRAVELERS INC 19940103 PRIMERICA CORP /NEW/ 19920703 SC 13G 1 a2180137zsc13g.txt SC 13G EX-99.1 2 a2180137zex-99_1.txt EXHIBIT 99.1