different between submodule vs bisubmodular

English

sub- +? module

submodule (plural submodules)

A module making up part of a larger module.
The first-year English Literature module consists of three submodules.
(algebra) A module contained in a larger module, both over the same ring, such that the ring multiplication in the former is a restriction of that in the latter.

bi- +? submodular

bisubmodular (not comparable)

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