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