$AB\rightarrow CDE$
$C\rightarrow D$
$E \rightarrow A$
$Candidate \ keys = \left \{ AB , EB \right \}$
For making above relation BCNF,
$\left ( A,B,D \right )$ , $AB \rightarrow D$
$\left ( A,B,C \right )$ , $AB \rightarrow C$
$\left ( C,D \right ), C \rightarrow D$
$\left ( E,A \right ), E \rightarrow A \ $
lossless but dependency $AB \rightarrow E$ is not preserved
