Theorem com4t

Commutation of antecedents. Rotate twice. (Contributed by NM, 25-Apr-1994.)

Hypothesis
com4.1
\( \vdash \varphi \rightarrow \psi \rightarrow \chi \rightarrow \theta \rightarrow \tau \)
Conclusion
\( \vdash \chi \rightarrow \theta \rightarrow \varphi \rightarrow \psi \rightarrow \tau \)
Proof
com4.1
com4l _
com4l _