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# Perl 6, 15 bytes

+*.repeated.Set


Try it online!

Pretty self explanatory. An anonymous code block that gets the count (+) of the Set of elements among the repeated elements of the input (*).

I've realised I've posted almost the exact same solution for a related question.

# Perl 6, 15 bytes

+*.repeated.Set


Try it online!

Pretty self explanatory. An anonymous code block that gets the count (+) of the Set of elements among the repeated elements of the input (*).

# Perl 6, 15 bytes

+*.repeated.Set


Try it online!

Pretty self explanatory. An anonymous code block that gets the count (+) of the Set of elements among the repeated elements of the input (*).

I've realised I've posted almost the exact same solution for a related question.

1

# Perl 6, 15 bytes

+*.repeated.Set


Try it online!

Pretty self explanatory. An anonymous code block that gets the count (+) of the Set of elements among the repeated elements of the input (*).