<image> As shown in the picture, it is a pattern of the wooden floor in a room, where AB=CD=DA, AE=CE=CF=FA. The pattern is composed of congruent triangular wooden blocks with patterns (shaded parts) and congruent triangular wooden blocks without patterns (middle parts). The area of this pattern is 0.05 square meters. If the area of the room is 13 square meters, how many patterned and plain wooden blocks are needed at least?