Sometimes you may want to merge two arrays, including duplicates.
Using the union function will merge the arrays, but it will only keep unique values.
A simple trick to accomplish this is by concatenating the arrays and then getting the duplicates.
split(
concat(
join(outputs(‘Compose_-_2_arrays’)?’array1′],’||’),
‘||’,
join(outputs(‘Compose_-_2_arrays’)?[‘array2’],’||’)),
‘||’)
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Marcel Lehmann 
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