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