1. An apparatus comprising: an associative memory, including first and second oscillators coupled to one another and each to couple to at least one memory, to perform operations comprising: shifting a frequency of the first oscillator away from its center frequency by a first shift amount based on a difference between portions of first and second patterns; and shifting a frequency of the second oscillator away from its center frequency by a second shift amount based on an additional difference between additional portions of the first and second patterns; wherein the first and second oscillators synchronize phases with each other based on the first and second shift amounts.