In the "brief" syntax, a 2 or 3 will give a "d" notation, rather than "nd" and "rd". The example says: 903d (brief), so the brief notation, used with the number 903 is d, not rd.
903d (brief)
903
d
rd
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In the "brief" syntax, a 2 or 3 will give a "d" notation, rather than "nd" and "rd". The example says:
903d (brief), so the brief notation, used with the number903isd, notrd.