RULEC1 is a top-level command.
RuleC1 -- the special case of RULEC where the chosen
variable has the same name as the bound variable.
The command format for RULEC1 is:

 <n>RULEC1   P4   D1   D3   H2      B      x      A     P4-HYPS    D1-HYPS    D3-HYPS    H2-HYPS 

The arguments have the following meaning:
P4 : Conclusion without Additional Hypothesis
D1 : Existentially Quantified Line
D3 : Conclusion with Additional Hypothesis
H2 : Hypothesis with Chosen Variable
B : Scope of Existential Quantifier
x : Existentially Quantified Variable
A : Conclusion to be Proven Using Existentially Quantified Line
P4-HYPS : Hypotheses
D1-HYPS : Hypotheses
D3-HYPS : Hypotheses
H2-HYPS : Hypotheses

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RULEC1 is an inference rule.
Its priority is NIL

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