Photostat Xerox clone copy counterpart cube ditto double dupe duplicate duplication facsimile hectograph manifold microcopy microfilm mimeo mimeograph model multigraph multiply by three quadruplicate reduplicate repetition replica replicate replication representation reproduce reproduction second carbon stat tern ternal ternary ternate three-ply threefold trace transcribe treble trilogic trinal trine triple triplex triplication triplicity