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In page Yoko Ono:

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By December 1974, Lennon and Pang considered buying a house together, and he refused to accept Ono's phone calls.[citation needed] The next month, Lennon agreed to meet Ono, who claimed to have found a cure for smoking. After the meeting, Lennon failed to return home or call Pang. When she telephoned the next day, Ono told her Lennon was unavailable, because he was exhausted after a hypnotherapy session. Two days later, Lennon reappeared at a joint dental appointment with Pang; he was stupefied and confused to such an extent that Pang believed he had been brainwashed. He told her his separation from Ono was now over, though Ono would allow him to continue seeing her as his mistress, which did not happen.[4]