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