`Na_(2)[B_(4)O_(4)(OH)_(3)].9H_(2)O``Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O``Na_(2)[B_(4)O_(6)(OH)_(5)].7H_(2)O``Na_(2)[B_(4)O_(7)(OH)_(6)].6H_(2)O`
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