"ruggedness"@en-us . . . "0"^^ . "04710588-n"^^ . . "104512305"@en-us . . . "104710588"^^ . . . . . "hardness"^^ . . . . . . "0.875"^^ . . "103706350"@en-us . "the quality of being difficult to do; \"he assigned a series of problems of increasing hardness\"; \"the ruggedness of his exams caused half the class to fail\""@en-us . . "hardness"@en-us . . . .