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