S01. Initialize a REPLACE-CSID container in full SID format equal
       to the first SID in the series
S02. Push the REPLACE-CSID container onto the compressed SID list
S03. Initialize a new REPLACE-CSID container in packed format if
       there are more than one SIDs and initialize the remaining
       capacity of the REPLACE-CSID container to 128 bits
S04. For each subsequent SID in the uncompressed SID list {
S05.   Set S to the current SID in the uncompressed SID list
S06.   If ComCheck(First SID, S) {
S07.     If the LNFL of S is lower than or equal to
           the remaining capacity of the REPLACE-CSID container {
S08.       Copy the Locator-Node and Function of S to the least
             significant remaining bits of the REPLACE-CSID
             container and decrement the remaining capacity by
             LNFL  // Note
S09.     } Else {
S10.       Push the REPLACE-CSID container onto the compressed SID
             list
S11.       Initialize a new REPLACE-CSID container in packed
             format with all bits set to 0
S12.       Copy the Locator-Node and Function of S to the least
             significant remaining bits of the REPLACE-CSID
             container and decrement the remaining capacity by
             LNFL  // Note
S13.     }
S14.     If S is not a REPLACE-CSID flavor SID, then break
S15.   } Else {
S16.     Break
S17.   } // End If
S18. } // End For
S19. Push the REPLACE-CSID container (if it is not empty) onto the
       compressed SID list