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