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a) Three enzyme modules for enzymatic diversification; b) Enzymatic assembly of Core M1 O-mannose glycans 16−21 from 1; c) Enzymatic assembly of C6-branched Core M1 O-mannose glycan isomers 22−27 from 2; d) Enzymatic assembly of symmetrical Core M2 O-mannose glycans 28−33 from 3.