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