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