PD Refractories Checker works better

#Series of letters in different dimensions #Quadrilaterals containing one or more letters #One quadrilateral #Quadrilaterals containing other figurative elements #Polygons with dark surfaces or parts of surfaces #Quadrilaterals containing one or more circles, ellipses or polygons (specify the content) #Quadrilaterals with dark surfaces or parts of surfaces #Five colours and over #Series of letters presenting different forms of writing #Letters overlapping #Polygons containing one or more letters #Other signs, notations or symbols, º (temp), #, bar codes #Polygons containing other figurative elements #Series of letters separated from one another other than by a single space #Two polygons, one inside the other (except 26.5.10 and 26.5.11)