This intermediary product can be further processed by direct exposure to carbonate solutions to form {HEAD ~ a second intermediary product} comprising carbon, {TAIL ~ metal carbonate}, and oxygen 
comprising
This intermediary product can be further processed by direct exposure to carbonate solutions to form { HEAD ~ a second intermediary product } comprising carbon , { TAIL ~ metal carbonate } , and oxygen
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH