american english - Pronunciation Rule for "nt" in the Middle of Words

Is there a "rule" or pattern for the pronunciation of "nt" in the middle of words, followed by a vowel (or "er" sound)?

Here's what I have so far:

1) "t" is often omitted in words like "wanted," "mental," and "international" when "nt" is followed by a vowel or an "er" sound.

2) If the syllable following the "nt" is stressed, the "t" is pronounced: "integrity," "intoxicated," and "intact"

3) In words with "int," the "t" is sometimes obligatory, such as in "interrogation" and "interpretation," BUT it is not obligatory in others like "interception." The only pattern I see so far is that when the root word has a stressed syllable following the "nt," this carries over into the longer forms of the word. For example, "inTERRogate" is pronounced with a "t" and "interrogation" is also pronounced with a "t" (even though the syllable following the "nt" is no longer stressed).

4) In words like "attention," the "ti" is pronounced as /ʃ/ ("sh").

Can anyone think of additional examples or rules? Are there any examples which would contradict my reasoning so far?