Attempt to identify which values were added in the transition from a to b
a list of values
another list of values
the values that were added to a to arrive at b
This can cause issues if ambiguous terms are in b, making it impossible to distinguish which arguments were added. For example:
a = c('a', 'b', 'b', 'b', 'a')
b = c('a', 'b', 'b', 'c', 'b', 'b', 'a')
makes it impossible to know whether c('b', 'c') was inserted after position 2, or whether c('c', 'b') was inserted after position 3.
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