Using RCA, the system would consider all three to be mutually confusable because they appear almost equally frequently in the same context.
while the preposition selector considers p b and p c to be confusable with p a , it does not conclude that p b and p c are also mutually confusable under context C. Thus, if most usage contexts contain only one or two preposition types, the preposition selector and RCA may produce similar confusion sets; but if the data also include usage contexts that contain three or more preposition types, RCA may offer confusion sets based on a more globally optimized similarity metric.