The next verse in the link Dosakkhayo provided is probably easier to understand:
“Kathaṁ duvidho paṭiccasamuppādo? Avijjā saṅkhārā taṇhā upādānaṁ—ayaṁ samudayo.56.4Viññāṇaṁ nāmarūpaṁ saḷāyatanaṁ phasso vedanā bhavo jāti maraṇañca—idaṁ dukkhaṁ. Yaṁ pana avijjānirodhā saṅkhāranirodho imāni tappaṭipakkhena dve saccāni. Tasmā paṭiccasamuppādo yena ākārena niddiṭṭho, tena tena niddisitabbo.”
The above verse is about separating the terms in Paticca Samuppada into two categories:
Samudaya (giving rise, the same as hetu): Avijjā, taṇhā, saṅkhārā, upādāna
Dukkha (suffering that can be stopped): Viññāṇa, nāmarūpa, saḷāyatana, phassa, vedanā, bhava, jāti, jarāmaraṇa
