133. (x+y)(x2−xy+y2+1)
134. (x2+3x−1)(x2−3x−1)
135. (x2+xy+y2)(x2−xy+y2)
136. (x2+2xy+2y2)(x2−2xy+2y2)
137. (x−2)(x+2)(x2−2x+4)(x2+2x+4)
138. (x+1)(x2−x+1)(x−3)(x2+3x+9)
139. (x−8)(x+5)(x−2)(x−1)
140. (2x+y−z)(2x−y+z)
141. N/A
142. 3(x−y)(y−z)(z−x)
143. 3xyz(x−y)(y−z)(z−x)
144. (x+y)(y+z)(z+x)
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