[ WZ020-白色1双(毛巾袜底) ]
[ WZ020-黑色1双(毛巾袜底) ]
[ WZ020-灰色1双(毛巾袜底) ]
[ WZ020-(2白+2黑+1灰)=5双 ]
[ WZ020-(2白+2灰+1黑)=5双 ]
[ WZ020-(2黑+2灰+1白)=5双 ]