There are two important special cases : ( i ) a simple closed chain and ( ii ) a simple chain open . There are two important special cases : ( i ) a simple open chain , and ( ii ) a simple closed chain .
Terdapat dua kes khas penting: (i) satu rantai tertutup mudah dan (ii) satu rantai terbuka mudah. Terdapat dua kes khas penting: (i) satu rantai terbuka mudah, dan (ii) satu rantai tertutup mudah.