"Section d" is that section that supplies the patterns consisting of two root consonants.
These root consonants can be alone as in
or can be preceded by a prefix as in
or can have a suffix attached to them as in
or can have a Prefix preceding them and at a time an Infix inserted between them as in
PI-d and so on.
or can have an Infix inserted between them and a Suffix attached to them as IS-d and so on.
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Be careful and write "Section d" within the Subject line.