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