guess what is "x" in Azure server names

src/sc_crawler/vendors/azure.py

@@ -155,6 +155,7 @@ def _prices(url_params: Optional[str] = None) -> List[dict]:
     # not part of the official docs, searched at random places
     "r": "RDMA capable",
     "e": "Memory Optimized",  # Standard_DC2es_v5
+    "x": "Unmatched Memory Capacity",  # TODO confirm
 }
 """Map lowercase chars from the server name to features."""