nang dang phyi
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To look at phyi, there are examples such as phyi rol, outside, phyi nas, from the outside, and so on.
Examples of nang are: nang nas, from the inside, nang du, within, and so on.
There's even a staccato-form of Tibetan, phyi nang, outer and inner, in Tibetan you don't need to write down each word, such as the missing and in this case.