basically alphabet divided into 4 groups
group 1 a b c d e
group2 f g h i j k l m
group3 n o p q r s
group4 t u v w x y z
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The four main dictionary groups are learners' dictionaries, bilingual dictionaries, specialized dictionaries, and etymological dictionaries. Learners' dictionaries are designed for language learners, bilingual dictionaries provide translations between languages, specialized dictionaries focus on a specific subject or field, and etymological dictionaries trace the history and evolution of words.