si'u BAI cmavo

sidju modal, 1st place (aiding agent) aided by ...

On affix form:

simxu
x1 (set) has members who mutually/reciprocally x2 (event [x1 should be reflexive in 1+ sumti]).

In notes:

sidju
x1 helps/assists/aids object/person x2 do/achieve/maintain event/activity x3.