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Are you referring to a copy machine. Duplex copies are printed on both sides of the paper. If copying from originals, normally the following options are available. 1 -> 1, single sided copies from single sided originals. 1 -> 2, double sided copies from single sided originals. so 4 sheets -> 2 double sided sheets. 2 -> 2, double sided originals make double sided copies. 2 -> 1, double sided originals make single sided copies. So 2 double sided originals make 4 sheets single sided copies.
Most photocopiers have a setting for double sided. One would need to select that setting, choose the number of desired copies, then feed the originals through the copier. They will come out double sided.
Yes they are
Ambigrams
Yes