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There are 27 eighteen-letter words containing 2O, P, T, U and Z

autocapitalizationautodiploidizationautopolymerizationautoprotonizationsautosplenectomizedconceptualizationsdepseudonymizationeupolyploidizationhypopneumatizationketophenylbutazonemicropulverizationmonophenylbutazonemultipolarizationsmuzzle␣compensatorsoccupational␣hazardoportuzumab␣monatoxoverpressurizationpentafluorobenzoicpentafluorobenzoylphotofunctionalizepolyfunctionalizedpseudoheterozygouspseudolocalization pseudo-localizationsouth␣temperate␣zonesupraorganizationszosterophyllaceous

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