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