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