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