fix list index out of range error (#2122)

Nixon

2024-10-09 5dbe6898cac191d12c487772d7336ab2b2a9c350

1
2
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5
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9
X    1
XX    2
XXX    3
XL    4
L    5
LX    6
LXX    7
LXXX    8
XC    9