PENGENDALIAN REJECT CONTAMINATION ON MARKING PADA PROSES MARK SCAN PACK (MSP) DENGAN PENDEKATAN SIX SIGMA (Studi Kasus di PT. Infineon Technologies Batam) THE CONTROL OF REJECT CONTAMINATION ON MARKING OF MARK SCAN PACK PROCESS (MSP) BY SIX SIGMA APPROACH (Case Study in PT. Infineon Technologies Batam)