niḥśreyasa
niḥśreyasa-arthāya
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for the ultimate perfection — SB 3.26.2
niḥśreyasa-īśvare
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the controller of the supreme perfection of life, or supreme liberation — SB 6.12.22
niḥśreyasa-karam
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very beneficial — SB 4.24.31
niḥśreyasa-karau
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all leading to the path of liberation — Bg. 5.2