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