Are any letters directly before and after H missing from Roman numerals? Hmmm, my chain of thoughts:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The Roman numerals are: I, V, X, L, C, D, and M. The letter H in the alphabet is preceded by G and followed by I. Final answer: yes.