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