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In page Tibetan Buddhism:

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Although lamrim texts cover much the same subject areas, subjects within them may be arranged in different ways and with different emphasis depending on the school and tradition it belongs to. Gampopa and Tsongkhapa expanded the short root-text of Atiśa into an extensive system to understand the entire Buddhist philosophy. In this way, subjects like karma, rebirth, Buddhist cosmology and the practice of meditation are gradually explained in logical order.[citation needed]