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