?? theory of x-building ew triple of flags with first two generically oriented ... generalized pluecker algebra bi-multigraded ...

?? theory of x-building ew triple of flags with each two generically oriented ... ??? 3! symmetry ... ?? localize previous example ...

?? theory of x-building ew apartment .... kaleidoscope group and maximal torus ...

?? x-building vs ... ??? x-building with extra stuff .... torsor of simply-connected form .... ??? ....

?? hmmm, still didn't straighten out .... ???? irrelevant models here .... ????? ....

?? stupid guess about a2 toric variety and "anti-flag" ... ??? doesn't even seem to generalize to a3 ... ??? ...

ad + be + cf = 0 ....

... but that's the flag constraint; we wanted anti-flag ... ??? ....