Perseverance.

The following may also be appropriate:

471, 475, 476, 477, 478, 479, 480, 481, 482, 484, 486, 488, 491, 494, 498, 501, 502, 503, 525, 537, 550, 552, 553, 556, 557, 558, 559, 560, 572, 581, 582, 588, 604, 611, 613, 658, 662, 706



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