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.
carvrama'e: m₁ is a bike/bicycle/tricycle/pedal vehicle carrying m₂ in/on surface/medium m₃, propelled by force m₄ transmitted via pedal(s) c₁=v₁.
pensi'u: x₁ (set) meet at x₂ (location).