From:
Paṭṭhānapakaraṇa
Dhammānulomapaccanīya (3), Tikapaṭṭhānapāḷi (1)
13.20. Ajjhattattika
Ajjhattaṁ dhammaṁ paṭicca nabahiddhā dhammo uppajjati hetupaccayā.
Bahiddhā dhammaṁ paṭicca naajjhatto dhammo uppajjati hetupaccayā. (Saṅkhittaṁ.)
Hetuyā dve …pe… avigate dve. (Sabbattha vitthāro.)