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