I can't remember where the material regarding L+1 group with hane on both sides (and the claim) came from now. Please feel free to remove the claim regarding the time.

I guess the material probably came from a godiscussions.com thread. Someone, possibly Bill, demonstrated the possibility of turning it into a ten-thousand year ko. But I think that it is true that this is a very recent development (within the past two or three years), because all the while I always thought that L+1 group with hane on both sides is unconditionally alive.