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