Good quiz but a few problems. You missed out DII, DIV, DVI, DIX, DXI, DXV, DXX, DXL, DLI, DLV, DLX, DXC and MMMX. MCII, MCIV, MCVI, MCIX are repeated. Also where there are more than 2 "M"s one fewer "M" works as a type-in, meaning that when I'm typing in "MMIV" I get to "MMI" and "MMMI" is filled in, for example.