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Solutions

ABM, ABN, ANL, AML, ANK, ABL, BNM, BNL, BJI, MNL, LNO, LNJ, LJK, NOJ, JOK, KOL, NJK, LNK, PRQ, RHI, PRI, PQI, RFS, RFG, RGH, FSG, IRG.
Thus, there are 27 triangles.
Hence, option B is the correct answer.