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