Tests for the gradation property of learning paths.
A learning path is considered a gradation if each state in a learning path differs from its predecessor and/or successor state by a single item/notion.
lpath_is_gradation takes an arbitrary list of learning paths and
tests for their gradation property.
list of logical values where each element represents one learning path.
Doignon, J.-P., Falmagne, J.-C. (1999) Knowledge Spaces. Heidelberg: Springer Verlag.
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