VI The V followed by a 'I' means five plus one. So this
VII In the same way V (five) plus II (two) is equal to
VIII And V (five) plus III (three) is equal to eight.
VIIII And V (five) plus IIII (four) is equal to nine.
NO! Just when you figured it out the overuse rule catches up with
us. Remember the minus rule? For every fifth element we change
the code. But just before we change the code, we introduce the
code with a smaller letter before it to represent the new
code minus one. The next code is 'X' (ten), and we meet it at
'X' (ten) minus 'I' (one), which is the ninth number in our list