Theorem expcomd

Deduction form of expcom. (Contributed by Alan Sare, 22-Jul-2012.)

Hypothesis
expcomd.1
\( \vdash \varphi \rightarrow \psi \wedge \chi \rightarrow \theta \)
Conclusion
\( \vdash \varphi \rightarrow \chi \rightarrow \psi \rightarrow \theta \)
Proof
expcomd.1
expd _
com23 _