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Again from Wikipedia the Buddhist doctrine of Dependent Arising:

The Twelve Nidanas

Main article: Twelve Nidanas
This twelve-factor formula is the most familiar presentation, though a number of early sutras introduce lesser-known variants which make it clear that the sequence of factors should not be regarded as a linear causal process in which each preceding factor gives rise to its successor through a simple reaction. The relationship among factors is always complex, involving several strands of conditioning.[11] For example, whenever there is ignorance, craving and clinging invariably follow, and craving and clinging themselves indicate ignorance.[12]
The thrust of the formula is such that when certain conditions are present, they give rise to subsequent conditions, which in turn give rise to other conditions and the cyclical nature of life in Samsara can be seen. This is graphically illustrated in the Bhavacakra (wheel of life).

The Twelve Nidanas:

English Terms Sanskrit Terms
With Ignorance as condition, Mental Formations arise With Avidyā as condition, Saṃskāra arises
With Mental Formations as condition, Consciousness arises With Saṃskāra as condition, Vijñāna arises
With Consciousness as condition, Mind and Matter arise With Vijñāna as condition, Nāmarūpa arises
With Mind and Matter as condition, Sense Gates arise With Nāmarūpa as condition, Ṣaḍāyatana arises
With Sense Gates as condition, Contact arises With Ṣaḍāyatana as condition, Sparśa arises
With Contact as condition, Feeling arises With Sparśa as condition, Vedanā arises
With Feeling as condition, Craving arises With Vedanā as condition, Tṛṣṇā arises
With Craving as condition, Clinging arises With Tṛṣṇā as condition, Upādāna arises
With Clinging as condition, Becoming arises With Upādāna as condition, Bhava arises
With Becoming as a condition, Birth arises With Bhava as condition, Jāti arises
With Birth as condition, Aging and Dying arise With Jāti as condition, Jarāmaraṇa arises

http://en.wikipedia.org/wiki/Prat%C4...samutp%C4%81da