Interaction between Flexible School and Mythic School

[bedeviler]

If you are playing an Archmage mythic character, and you take the 1st tier power Flexible School, which lets you get the powers from a second school with a level equal to your mythic tier. At second tier you gain Mythic school, which adds 4 to your level for determining the levels for a school that you have. Does Mythic School effect just 1 school and you must pick the 1 that it works on or does it effect both of them?

[Saethori]

Flexible School wrote:

Select one wizard arcane school that is not your arcane school. You gain powers from that arcane school, treating your tier as your wizard level for the purposes of these powers. Once you have chosen the arcane school, it cannot be changed. You cannot select an arcane school that is one of your opposition schools. You must have the arcane school class feature to select this ability. You can choose this ability up to three times, each time selecting another arcane school other than your own.

Mythic School wrote:

When determining the effects of your arcane school powers, you’re considered 4 levels higher. This increases the effects of powers you have access to, but doesn’t grant you powers at a lower level than normal. If you have an arcane school power that can be used multiple times per day, such as blinding ray, you gain a number of extra uses of that power equal half your tier (minimum 1). You must have the arcane school class feature to select this ability.

Flexible School gives you school powers. Mythic School increases your effective level for ALL your school powers, without making any sort of specification for any singular school.

All your schools' powers increase.