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