5 Aggregates of Clinging...

The Panca Khanda are:
Rupa - Matter
Vedana - Feeling
Sanna - Perception
Sankhara - Mental Formations
Vinnana - Consciousness

And these 5 constitute all conditioned things, and thus are Dukkha. Our ignorance, avijja, blocks us from knowing the true nature of existence, hence we are sent through the unbreaking chain that is paticca samuppada. However, if we can eradicate our avijja through developing wisdom, panna, then we will see that our existence is no more than these 5 aggregates, always changing, with no permanent entity, and unsatisfactory. Then we will be able to taste the sweet liberation of Nibbana!