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