Chandaḥśāstram - 16
[Viṣamavṛtta] [Padacaturūrdhva] pratipādaṁ catur-vṛddhyā padacaturūrdhvam // 5:20 // [Padacaturūrdhva = 8 akṣara, 12 akṣara, 16 akṣara, 20 akṣara] [Āpīḍa] gāvanta āpīḍaḥ1 // 5:21 // [⏑⏑⏑⏑⏑⏑−−, ⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑−−, ⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑−−, ⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑−−] [Pratyāpīḍa] gāvādau cet-pratyāpīḍaḥ // 5:22 // [−−⏑⏑⏑⏑⏑⏑, −−⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑, −−⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑, −−⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑] [Pratyāpīḍa] pratyāpīḍo gāvādau ca // 5:23 // [−−⏑⏑⏑⏑−−, −−⏑⏑⏑⏑⏑⏑⏑⏑−−, −−⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑−−, −−⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑⏑−−]
1
This metre and the two that follow are specific varieties of Padacaturārdhva.