Answer the following question: Given the following passage  "The three marks of existence may reflect Upanishadic or other influences. K.R. Norman supposes that the these terms were already in use at the Buddha's time, and were familiair to his hearers.",  answer the following question. Note that the answer is present within the text.  Question: How recognizable was the Upanishadic text to Buddha's people
Answer:
familiair