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supported mass units: g (gram), sg (pieces), lbm (pound), u (atomic mass), ozm (ounce), stone, ton, grain, pweight (pennyweight), hweight (hundredweight), bron (gross registered ton).
unidades de massa conhecidas: g (grama), sg (partes), lbm (libra), u (massa atómica), ozm (onça), stone, ton (tonelada), grain, pweight ('pennyweight'), hweight ('hundred weight'), bron (tonelada bruta).