Second,
Combination method, which freely set, each letter like as minimal pairs.
A morpheme is the smallest linguistic unit that has meaning.
Those are major assignment for Shorthand Inventor or Improver.
How many letter materials for writing sounds and words should be provided, how to fit language best are the subject for them.
Adoption to Language will be based on language characteristics and combination sounds, further more Grammatical characteristics.
Coding is a symbolizing system for language by abbreviation.
Basic letter, Vocabulary and Grammatical Idioms should be designed Shorthand theory in harmony.
So Shorthand theory should integrate the Phoneme = Grapheme = The Word ＝ Meaning Interrelation system for translating oral signal to literal orthography.