OLIGOPOLISTIC

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cig cis cog col coo cop cos cot gip git goo gos got ill its lip lis lit log loo lop lot oil oot ops opt pic pig pis pit poi pol poo pot psi pst sic sip sit sol sop sot tic til tip tis tog too top

cigs cist clip clog clop clot cogs coil cols colt cool coop coos coot cops cost cots gill gilt gips gist gits glop goop goos ills lilo lilt lips lisp list lits loci loco logo logs loop loos loot lops lost loti lots oils olio oops oots opts otic pics pigs pili pill piso pits plot poco pois poll polo pols pool poos post pots scop scot sill silo silt slip slit slog slop slot soil soli solo soot spic spit spot stop tics till tils tipi tips togs toil toll tool topi topo tops