Context: Although the Estonian orthography is generally guided by phonemic principles, with each grapheme corresponding to one phoneme, there are some historical and morphological deviations from this: for example preservation of the morpheme in declension of the word (writing b, g, d in places where p, k, t is pronounced) and in the use of 'i' and 'j'.[clarification needed] Where it is very impractical or impossible to type š and ž, they are substituted with sh and zh in some written texts, although this is considered incorrect. Otherwise, the h in sh represents a voiceless glottal fricative, as in Pasha (pas-ha); this also applies to some foreign names.

Question: What principles usually govern the Estonian orthography?
Answer: phonemic principles

Question: To how many phoneme's does each grapheme correspond?
Answer: one

Question: What type of deviations are there from the single phoneme to each grapheme general principle?
Answer: some historical and morphological deviations

Question: On what occasions are š and ž replaced with sh and zh?
Answer: Where it is very impractical or impossible to type š and ž

Question: What is an example of a word containing a voiceless glottal fricative?
Answer: Pasha (pas-ha)

Question:  What principles never govern the Estonian orthography?
Answer: Unanswerable

Question: On what occasions are š and ž replaced with ch and zu?
Answer: Unanswerable

Question:  What is an example of a word not containing a voiceless glottal fricative?
Answer: Unanswerable

Question: Foreign names are not considered what? 
Answer: Unanswerable