(i) = between, among.
intercēdere = come between.
intellĕgere = pick among, perceive.
(ii) = breaking a continuity.
interclūdere = shut off, blockade.
interfĭcere = destroy (lit. put between).
OB-, OBS-, OC-, OF-, OP-, O-, = against, on account of.
(i) = over against, before (as an obstruction).
offendere = strike against.
oblŏqui = speak against.
(ii) = towards, with the idea of favour or compliance.
oboedire = hearken to.
obsĕqui = follow compliantly.
PER-, = through, along.