database - What does "Conversion of the ER diagram into a minimal set of relations" mean? -

i supposed "convert er diagram minimal set of relations". have er diagram, not best, sufficient, includes entities, attributes, relations, etc. supposed convert relational schema or else entirely? appreciated. thanks.

edit: looking @ topic converting er diagram relational model has been done here er diagram set of create table statements based on relationships need well, based on question asked?

i know "minimal superkey" key cannot have less values , still work key. maybe minimal set of relations mean has have information specified no repeats or information?