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