The same rules that apply to long vowels also apply to diphthongs, which themselves are long, i.e, two beats. Note the following examples:
Remember that the vowels α, ε and ο CONTRACT when they meet. Each vowel or diphthong that they create when they contract is long. The accent used to mark the newly formed contractions or diphthongs is determined by where the accent was placed before the contraction. The same rules for marking an acute (/) or circumflex (^) for long vowels and diphthongs also apply for contract vowels. Consider the following examples:
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