CAMERON, Justice.
We granted this petition for special action pursuant to Rule 7(a), Rules of Procedure for Special Actions, 17A A.R.S., and Article 6, § 5 of the Arizona Constitution because this is a matter of state-wide importance and there is no equal, plain, speedy and adequate remedy by appeal.
We must answer the following question: Is the Arizona corporation Commission estopped to deny the validity of a certificate of public convenience and necessity...
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