With meaning / function. Take the cmavo preceding as the selma'o, and convert the arbitrary bridi following it to give it meaning or function.
General cmavo creation for existing grammar. This can be used to convert arbitrary meaning (or cmavo, represented in a bridi) to a desired selma'o. This is sei specialized to modifying the meaning of the cmavo or word preceding ma'o'ei while preserving its grammar. (See also ci'o'ei for a specialization of ma'o'ei to UI.) ni'o (See ze'ei for a similar word restricted to a single word only rather than general bridi to express semantics (and with opposite order, perhaps like tanru) to coin nonce cmavo without allocating new experimental forms.)