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