Relative configurations of consecutive, but not necessarily contiguous, constitutionally equivalent carbon atoms that have a symmetrically-constituted connecting group (if any) are designated '@M03838@' or 'racemo', as appropriate. Examples: (The symbol M03856-2.png represents a symmetrically-constituted connecting group, such as –CH₂–, –CH₂–CH₂–, or –CR₂–CH₂–CR₂–.)