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-module(sample_behaviour).
-type custom() :: 1..42.
-callback sample_callback_1() -> term().
-callback sample_callback_2() -> atom().
-callback sample_callback_3() -> {'ok', custom()} | 'fail'.
-callback sample_callback_4(term()) -> 'ok'.
-callback sample_callback_5(custom()) -> 'ok' | 'fail'.
-callback sample_callback_6(custom(), custom(), string()) ->
{'ok', custom()} | 'fail'.
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