B = bases(FM)
An ordered list $\{B_1, \ldots, B_k\}$ of sets is a basis of a flag matroid $\mathbf M = \{M_1, \ldots, M_k\}$ if $B_i$ is a basis of $M_i$ and $B_i \subseteq B_{i+1}$ for all $i$. This method computes the bases of a flag matroid.
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The source of this document is in GKMVarieties/Documentation_GKMVarieties.m2:1919:0.