The concentration generated by “a few breaths in a row” is far too little to sustain attention on the pleasant sensation. The student becomes distracted and/or the pleasant sensation disappears. Similarly, someone switches to a pleasant sensation as soon as one appears. They have not established access concentration and soon become distracted and are unable to maintain focus on the pleasant sensation or the pleasant sensation disappears. Similarly, someone does actually generate access concentration but almost immediately switches to a pleasant sensation, maybe just as soon as genuine access
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