detachable portion

See: coupon
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Tenders are invited for Supply of Printed 06 Lakhs A4 size in landscape OMR Answer Books of 40+4 Pages (40 pages + 2 pages OMR Sheet with Bar Code having 2 bar code detachable portion, of good quality 105 GSM paper + 2 Page revaluation Sheet), fabricated with 70 GSM maplitho Paper duly printed with University Insignia on top and page no.
If respondents will be entered in a drawing or receive a discount, make sure your survey includes a detachable portion for that information.