In fact, the solvent DMF is used in the examples of the present application (see page 17, lines 18 to 21), according to which not only PAH-contaminants but substantially all PAH, sulphur and nitrogen-containing substances and other contaminants are removed from the treated petroleum distillate (page 21, lines 7 to 10).Therefore, in the Board's view, the originally filed documents of the applicatio