The following comes from the Moon Instruction Manual:
Moon is a tactile medium which uses raised characters to represent normal print characters. There are two levels of Moon, which we call Grades One and Two. Grade Two is basically the same as Grade One, but with the addition of some abbreviations not found in Grade One—this is the only difference...
Wherever possible, Moon follows print conventions with regard to punctuation and spacing between characters and words...
There are 26 Moon symbols which correspond to the 26 letters of the alphabet:
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