(AP^W R-bending and W L-bending) and (lateral^W flexion and W extension)
(ap^w r-bending and w l-bending) and (lateral^w flexion and w extension)
(Views AP^W R-bending + W L-bending) + (view lateral^W flexion + W extension)
(views ap^w r-bending + w l-bending) + (view lateral^w flexion + w extension)