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There are 572 eighteen-letter words containing 3I, O, P and S

(page 3)

oversimplisticallyoversophisticationoverspecialisationoverspecializationoversusceptibilityPakistan␣TelevisionpalaeobiodiversitypalaeodistributionpaleaodistributionpaleobiolinguisticpaleodistributionspaleonutritionistsPalestinianisationPalestinianizationpancreatolithiasispanhypopituitarismparacoccidioidomasparaconductivitiesparavirtualisationPareto␣distributionparish␣pump␣politicsparsimony␣principleparticularisationsparticularizationspartition␣functionspedestrianisationspedestrianizationspedophilic␣disorderpeptidoglycolipidspericardiocentesisperipheralizationsperitoneal␣dialysispermineralizationspernicious␣anaemias pernicious␣anæmiasperspectivizationspetite␣bourgeoisiesphacoiridencleisispharmacokineticistpharyngotonsilitisphilosophies␣of␣mindphosphonodiamiditephosphosensitivityphosphospecificityphotoassimilationsphotodissociationsphotoinactivationsphotoisomerisationphotoisomerizationphotoperiodicitiesphotoreversibilityphotoselectivitiesphotosensitisationphotosensitivitiesphotosensitizationphotostabilizationphotosterilizationphotoswitchabilityphysicochemicalismphysiobiochemistryphytostabilisationphytostabilizationpicking␣and␣choosingpicornavirologistspiezopsychrophilicpiezoresistivitiespillow␣dictionariesPinocchio␣illusionspiperonylonitrilespiriformis␣syndromepiscirickettsiosispissing␣into␣the␣windplagiogravitropismplanning␣permissionpleuraspidotheriidplurinationalitiesplurisignificationpocket␣dictionariespoikiloblasticallypoints␣of␣inflectionpolice␣commissionerpolitical␣commissarpolitical␣economiespolitical␣economistpolitical␣prisonerspolitical␣scientistpoliticohistoricalpolydispersibilitypolydispersivitiespolyesterificationpolymerizabilitiespolymerogenicitiespolyvictimizationsPortuguesificationpositional␣asphyxiapositional␣notationpositive␣lookbehindpositive␣neutralismpositive␣neutralitypositive␣transitionpostadministrationpost-impressionismspostimpressionistspostlinguisticallypostmillenarianismpostmillennialistspostmultiplicationpostprecipitationspostrehabilitationpoststratificationposttribulationismposttribulationistpotassium␣inosinatepragmaticalisationpreadministrationspredestinationistsprediscontinuationpredispositionallyprehospitalizationpremultiplicationsPresidency␣divisionprestidigitatorialpretribulationistsprice-earnings␣ratioprimary␣legislationprime␣decompositionPrimitive␣Methodistprimitive␣recursionprior␣probabilitiesprobabilificationsprobability␣densityproblematicalitiesprocedure␣divisionspro-circumcisionistprofessional␣victimprognostificationsproletarianisationpronominalizationspropositional␣logicproposition␣nationspropriosensitivityprospidium␣chlorideprotease␣inhibitorsprovincial␣capitalsprovincialisationsprovincializationsprovisionalizationprovisional␣licensepseudoappendicitispseudoconditioning

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