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