Finite groups all of whose maximal subgroups of even order are PRN-groups

Let G be a finite group. A subgroup H of a group G is called pronormal in G if the subgroups H and H-g are conjugate in < H,H-g > for each g is an element of G. A group G is said to be a PRN-group if every minimal subgroup of G or order 4 is pronormal in G. In this paper, we characterize groups G such that G is a non-PRN-group of even order in which every maximal subgroup of even order is a PRN-group, and come to that such groups are solvable, have orders divisible by at most 3 distinct primes. And some additional structural details are provided.