Errrrr... three.
Phoenetics don't alter the base meaning of words. 'Tree', 'Aight', 'Fower' etc should only be used in training manuals to demonstrate to the student the correct way of speaking the words.
The fact is, somebody reading that document is assumed to understand this already. It'd be like writing French out as... "Bon-jaw mon-sewer..." etc etc in every single text other than French dictionaries!
Although I apologise in advance in case this wasn't your point whatsoever!