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