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Which of the following set of polymers contains same monomer which is used to prepare urotropine on reaction with NH3?
1) Nylon-6, glyptal, nylon-6, 6
2) Nylon-6, urea-formaldehyde resin, melamine-formaldehyde resin
3) Glyptal, urea-formaldehyde resin, melamine-formaldehyde resin
4) Glyptal, urea-formaldehyde resin, Nylon-6,6
3) Glyptal, urea-formaldehyde resin, melamine-formaldehyde resin