Gargish Alphabet and Duplicate Single Letters vs Double Letters

VeryCoolCat

Apprentice
Several of the recipes have SH for example... but there is an SH rune and a S and H rune respectively.

For example.

SHU - theres an SH rune and separate S and H runes
ZHAJD - theres a ZH rune and separate Z and H runes.

Is it interchangeable or one way is correct and one way is wrong?
 
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