The 30 names drawn from Compartment A of the jury box shall be placed in a box, and the names drawn from the box by the appointed person. The names so drawn shall be one of the jury, unless challenged by either party, until six jurors and four alternates, which have not been challenged, are drawn. Neither party shall have more than six challenges to jurors nor more than four to alternates and such other challenges for cause as the court may permit. When any of the six jurors, unchallenged, cannot be found or are disqualified by law and the parties do not supply the vacancy by agreement, names shall be randomly drawn from Compartment A until sufficient jurors and alternates are selected.
('86 Code, § 7.203)