From the instructions, we can see that the original book has been subjected to an update which involves some simplifications such as ignoring the 5-letter groups:

Three of the 4 spelling tables have been omitted. Note that the numbers used for spelling overlap other groups and so the group that precedes a spelt word also defines the number of letters.

Worked example: (Note only repeated goup is 'Marseilles')

More groups to assist with interpreting multiple options:

Front cover, title page and contents pages

Codebook proper

Dates and numbers

Spelling system

Decyphering

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