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