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