I no expert on English or any other metre. I think that typical English metres work with an alternation of sequences of one accented syllable and one or more unaccented syllable. Only (so called) iambs, trochees, anapaests and dactyls fit such a scheme. What counts as accented for the metre can depend on what the neighbouring element contains, so that a normally non-accented syllable in a word of more than one syllable can count as accented for the metre, so long as the neighbouring syllables are not accented.
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