Each Veda has its own Aranyakas and Upanisads. Aranyakas were mainly meant for ascetics who lived in forest. Kaushitaki Aranyakas and Aitareya Aranyakas are parts of Rig-Veda. Taittriya Aranyaka and Taittriya Upanisads are parts of Krishna-Yajurveda.
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