How would i go about getting the number of keys of the hash that's within my hash?

For example, if i had a main hash which contained hashes named first, second, third. How could i find out how many keys that the hash first contained?

I've been trying to simply use the hash in a scalar context but i must be referencing something wrong because everything i try gives some kind of syntax error.

In reply to num keys of the hash within hash? by Anonymous Monk

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