We cannot easily obtain a list of these in advance, but we observe that they always consist of a pair u and v of patterns from near the top of the frequency list.
we also precompute the locations uXvXw of patterns in which both u and v are among these super-frequent patterns (all unigrams), treating this as the collocation of the frequent pattern uXv and frequent pattern w. We also compute the analagous case for u and vXw.