Phonetics

A E I O U F H J K L M N P R S T W   [The Alphabet]

5 VOWELS
A O U                        [a]¹ [o] [u]²
E I                             [e]³ [i]
Long Vowels:
Ā Ē Ī Ō Ū                 [a:] [e:] [i:] [o:] [u:]4

¹ may be pronounced [ɑ]
² may be pronounced [ɯ]
³ may be pronounced [ɛ]
4 if macrons cannot be used, double the letter: e.g. aa for ā.

12 CONSONANTS

Stops:                    K P T      [k] [p] [t]
Nasals:                  N M        [n] [m]
Fricatives:            S H F      [s]¹ [h]² [f]3
Glides:                  W J          [w] [j]
Liquid / Flap:      R L          [r]4 [l]

¹ may be pronounced [ʃ]
² may be pronounced [x]
³ may be pronounced [φ] or [υ]
4 may be pronounced [ɾ] or [ɹ]

Voiced stops and fricatives are not used because there is no difference between voiced and voiceless stops/fricatives in many languages. The letters used for the sounds are the resp. IPA symbols. The choice of the sounds is based on the frequency of the sounds in world's languages.