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