separating consciousness-feeling-perception

From M43 the Mahavedalla Sutta: > It is said consciousness. Friend, what is consciousness?: It knows, > therefore it is called consciousness. Knows what? Knows this is > pleasant, this is unpleasant and knows this is neither unpleasant nor > pleasant. Knows therefore it is said conscious. Friend, this knowledge > and this consciousness, are they associated or dissociated? Is there a > method to differentiate them and show them apart? What is known is > consciousness and consciousness is knowledge. Therefore these things > are associated and not dissociated and it is not possible to > differentiate them and show them apart. then later: > Friend, this feeling, perception, and this consciousness, are these > associated or dissociated? Is it possible to differenciate them and > show them apart?: Friend, feelings, perceptions and consciousness are > associated and not dissociated and it is not possible to differentiate > them and show them apart: Friend, the felt is perceived, and the > perceived is consciously known Therefore these things are associated > and not dissociated and it is not possible to differenciate them and > show them apart. If these three - consciousness, perception, and feeling - cannot be told apart, how are they conceptualized separately in the first place? It's a contradiction. If they cannot be told apart, why bother listing them as 3 separate aggregates? Why not just say the three arise together?