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