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