The opinion
On Petition for Rehearing.
PER CURIAM.
Because of the novelty of some of the questions discussed in our opinion in this case, and the fact that there was little or no reference to these questions, or some of them at least, in the original briefs and on oral argument, we think it reasonable and proper to grant the parties an opportunity to file such further and supplemental briefs as they may desire. Main briefs must be filed on or before June 3, 1963, and answering briefs no later than June 10, 1963. We shall give the case further consideration after receiving these briefs. There will be no further oral argument. To the extent above indicated the petition for rehearing is granted.