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