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symdiff
`collections.SymDiff` (alias `symdiff`) returns the symmetric difference of two collections.
2018-11-07
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COLLECTION | symdiff COLLECTION
0.51

Example:

{{ slice 1 2 3 | symdiff (slice 3 4) }}

The above will print [1 2 4].

Also see https://en.wikipedia.org/wiki/Symmetric_difference