Rasarnavasudhakara 3.381.p2

3.381.p2

ity atra bāla-rāmāyaṇam ity uttarasya bahir eva mṛgyatvād bahir-lāpā nāma nālikeyam |

Here, since the answer—namely 'Bālarāmāyaṇa'—must be sought outside [the verse] itself, this is the enigma named 'external riddle' (bahirlāpā).