"0.75"^^ . . . . . . . . . "becoming proficient in the use of something; having mastery of; \"his mastering the art of cooking took a long time\""@en-us . "05757234-n"^^ . "104441097"@en-us . . "mastering"@en-us . . . . "becoming proficient in the use of something; having mastery of; \"his mastering the art of cooking took a long time\""@en-us . . "105424260"@en-us . "105757234"^^ . . . . . "0"^^ . "mastering"^^ . .