From 1NF to BCNF, two relations are required. One with Primary key and all Single valued attributes and the other with the primary Key and all multi valued attributes.
In 4NF , there are relations for each multi valued attributes.
Ex. A ia a Entity Set, with key a1 and a2,a3 are single valued attributes and mv1,mv2 are multi valued attributes.
A( a1,a2,a3,mv1,mv2)
Converting E-R to Relational Model,
A1(a1,a2,a3) and A2(a1,mv1,mv2)
In 4NF
A1(a1,a2,a3) , A2(a1,mv1) and A3(a1,mv2)