CASES4 is a top-level command.
Rule of Cases.
The command format for CASES4 is:

 <n>CASES4   P10   D1   P9   H8    P7     H6     P5     H4     P3     H2      D      C      B      A      E    P10-HYPS    D1-HYPS    P9-HYPS    H8-HYPS    P7-HYPS    H6-HYPS    P5-HYPS    H4-HYPS    P3-HYPS    H2-HYPS 

The arguments have the following meaning:
P10 : Conclusion for All Four Cases
D1 : Line with Disjunction
P9 : Conclusion in Case 4
H8 : Line with Assumption for Case 4
P7 : Conclusion in Case 3
H6 : Line with Assumption for Case 3
P5 : Conclusion in Case 2
H4 : Line with Assumption for Case 2
P3 : Conclusion in Case 1
H2 : Line with Assumption for Case 1
D : Disjunct Four
C : Disjunct Three
B : Disjunct Two
A : Disjunct One
E : Conclusion
P10-HYPS : Hypotheses
D1-HYPS : Hypotheses
P9-HYPS : Hypotheses
H8-HYPS : Hypotheses
P7-HYPS : Hypotheses
H6-HYPS : Hypotheses
P5-HYPS : Hypotheses
H4-HYPS : Hypotheses
P3-HYPS : Hypotheses
H2-HYPS : Hypotheses

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CASES4 is an inference rule.
Its priority is NIL

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