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Predicate xref_called/5
 xref_called(?Source, ?Called, ?By) is nondet
 xref_called(?Source, ?Called, ?By, ?Cond) is nondet
 xref_called(?Source, ?Called, ?By, ?Cond, ?Line) is nondet
True when By is called from Called in Source. Note that xref_called/3 and xref_called/4 use distinct/2 to return only distinct Called-By pairs. The xref_called/5 version may return duplicate Called-By if Called is called from multiple clauses in By, but at most one call per clause.
Arguments:
By- is a head term or one of the reserved terms '<directive>'(Line) or '<public>'(Line), indicating the call is from an (often initialization/1) directive or there is a public/1 directive that claims the predicate is called from in some untractable way.
Cond- is the (accumulated) condition as defined by :- if(Cond) under which the calling code is compiled.
Line- is the start line of the calling clause.
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