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