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