You missed L.
If they are in, you will have the following (font colour white, so highlight to view):
{I, IV, V, VI, IX, X, XI, XIV, XV, XL, XLV, L, LI, LV, LX, LXI, LXV, XC, XCI, XCIV, XCV, C}
You could then introduce D (1,000).
I therefore don't think they contribute to a list of meaningful "words".
I would reject all Roman "numerals".
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