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These are the two last stages in the 4 foundations of mindfulness:
Citta means "mind". Dhamma refers to the Buddhist teachings.
Cittanupasana is the meditation on the mind: the observation of the arising and setting of thoughts and desires. It is required to understand the impermanent nature of mind, which is wrongfully perceived as a permanent self.
Dhammanupasana is meditation on the Dharma, the Buddhist teachings. Typically a student will be asked to meditate/research one of these topics: