dynkinType(L)
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Note that low rank isomorphisms between classical groups are automatically used so that the letter is alphabetically minimal and the elementary types are irreducible (D2=A1xA1).
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The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/WeylGroups.m2:4053:0.