Geometry question, I guess

This isn't homework, just something I'm working on to pass the time, and I've hit a dead end.  What I'm trying to think of is 4 two-dimensional shapes on the surface of a sphere that each share the exact same amount of their perimeter with EVERY other shape.  Eg, if shape #1 shares 5 units along it's borders with shape #2, it also shares 5 units with #3 and #4, #2 shares 5 units with #3 and #4, and so on.  I just can't seem to get it.  Was about to give up, and then I remembered /sci/ and I thought anon might have some insight somewhere in his collective.

>>4

Totally forgot to mention that.  Yeah, I'm trying to cover the whole sphere with these 5 shapes.  (It a fair bit easier otherwise, as >>3 showed (I think))

>>2

The shapes don't have to be the same shape at this point, originally that's what I was shooting for, but I couldn't figure it out even with making them different shapes.  The only requirement is that they all share the same amount of perimeter with each other and they fill the sphere.