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