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