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