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M1, M2 ... stresses
med.	обозначение поколений при экспериментальном мутагенезе
English thesaurus
M1, M2
abbr., fin.	Public Financial Management Division, I, II
M₁,M₂
abbr.	first,second generation of induction

M 1 , M >2 : 5 phrases in 4 subjects

Gold mining	1
International Monetary Fund	1
Makarov	2
Optics branch of physics	1