LO can be mentioned in any of the Specs, CM, or Expert Belt sets. Either in the Set Comments or in the AC. I personally believe that it fits better to the nature of the Specs set, which aims to be a wallbreaker. The EB values a lot the surprise factor, while the CM set has some sweeping potential, and it would be a shame to put those to waste by using 4 attacks + LO.
tl;dr slash LO with Specs and add a sentence in the AC about LO.
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me for a check!