a collection V (whose elements are called vertices or nodes), taken with a multiset E, each of whose elements (called a benefit or line) is a cardinality-two multisubset of V.
a collection V (since before), taken with a multiset E, all of whose elements is a cardinality-two subset of V.
A combined rotary type-setting and printing machine for office use. The type is transferred semi-automatically by means of keys from a type-supply drum to a printing drum. The printing may be done by means of an inked ribbon to print “typewritten” letters, or directly from inked type or a stereotype plate, as in a printing press.