\[\begin {array} {1 1} (1)\;n_2= \infty \;to\; n_1=2 & \quad (2)\; n_2=4 \;to \; n_1=3\\ (3)\;n_2=2\;to \;n_1=1 & \quad (4)\;n_2=5 \; to \;n_1=3 \end {array}\]

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