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