Suppose we want to combine of, meaning "black", with kix, meaning "mole". We simply take the modified tone of the first syllable and follow it by the second syllable. The result is okix (meaning "black mole"). Following the rules of MTL reading, kix is the longest possible syllable starting from the right. Thus the first syllable is the simple vowel o and the second syllable is kix, and no apostrophe is needed.
If we combine og ("evil") and ix ("intention") without an apostrophe, we also get okix. By the rules of reading MTL, the final syllable appears to be kix. Therefore, we must insert an apostrophe (ok'ix) to indicate that the last syllable is ix. Now we know the first syllable is ok, which is the modified tone of og. The word ok'ix means "evil intention".
Please ensure that your word processor is not automatically substituting another character for this symbol, especially if writing documents for the web.