How do I decide if these five tires are holed too close to the sidewall?
http://i.cubeupload.com/qD9rZv.jpg

Yesterday, for practice in dismounting, patching, and remounting, I patched
these 5 tires above, which a friend and I had lying around.
http://i.cubeupload.com/gCNODb.jpg

For the purpose of this thread, we can ignore the tread wear since the
question is being asked about how to decide when a nail hole is too close
to the sidewall.
http://i.cubeupload.com/0X8NfQ.jpg

I guess the first question is *WHY* we can't patch next to the sidewall.
Is it that the patch won't hold? Why?
Is it that the patch will flex too much?
Or is it that the belts are damaged and they will break?