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christmas cards products odd numbers sport means probabilty cryptic clues folding tube maps clocks sum to infinity ave cube numbers triangle numbers prime numbers integers digits coordinates pascal's triangle grids probability perfect numbers bases calculus functions circles proportion taxicab geometry numbers trigonometry integration number dice irreducible numbers geometry menace chess crossnumbers graphs surds squares angles ellipses star numbers doubling rectangles factors shapes people maths the only crossnumber cryptic crossnumbers quadratics median crosswords arrows volume perimeter elections polygons speed percentages scales shape floors coins averages area regular shapes spheres tiling wordplay square numbers planes multiplication range algebra palindromes sequences 3d shapes gerrymandering advent dates differentiation routes games hexagons dominos colouring chalkdust crossnumber digital clocks mean indices sums money factorials time parabolas triangles logic addition fractions chocolate remainders unit fractions balancing rugby complex numbers multiples lines symmetry crossnumber dodecagons books square roots 2d shapes division partitions