30-7 = <<30-7=23>>23 inches of Pat’s stick is not covered in dirt.
Sarah’s stick is 23*2 = <<23*2=46>>46 inches long.
Jane’s stick is 12*2 = <<12*2=24>>24 inches shorter than Sarah’s stick.
Jane’s stick is 46-24 = <<46-24=22>>22 inches long.
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