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