Decompose Relation R(ABCDE) in 2nf and 3nf
The following two FD's violate 2NF:

A-&gt;C
B-&gt;D


We can create new relationships based upon those FD's: (AC;A-&gt;C), (BD;B-&gt;D), (ABE;AB-&gt;E).  This set of relationships now satisfies 2NF (and also 3NF and BCNF).