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