Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Hungarian ritka
Russian редко (cognate)
Serbo-Croatian rijedak (cognate)
Slovene redek (cognate)

Hungarian -n (mention)
Hungarian ritkaság (affix)
Hungarian ritkább (affix)
Hungarian ritkán (affix)
Hungarian ritkábban (affix)
Hungarian legritkábban (affix)