Properties of Congruent Figures

See if you can figure out which steps to this proof use CPCTC (Corresponding parts of congruent triangles are congruent).

Given that $\bigtriangleup$CBE is congruent to $\bigtriangleup$CAD, prove that $\angle$BDE is congruent to $\angle$AED.

$1.$ $\bigtriangleup$CBE is congruent to $\bigtriangleup$CAD

$2.$ $\overline{AD}$ is congruent to $\overline{BE}$

$3.$ $\overline{AC}$ is congruent to $\overline{BC}$

$4.$ $\overline{CD}$ is congruent to $\overline{CE}$

$5.$ $\overline{AE}$ = $\overline{AC}$ + $\overline{CE}$

$6.$ $\overline{BD}$ = $\overline{BC}$ + $\overline{CD}$

$7.$ $\overline{AE}$ = $\overline{BC}$ + $\overline{CD}$

$8.$ $\overline{AE}$ = $\overline{BD}$

$9.$ $\overline{DE}$ = $\overline{DE}$

$10.$ $\bigtriangleup$AED is congruent to $\bigtriangleup$BDE

$11.$ $\angle$BDE is congruent to $\angle$AED

Which steps use CPCTC?