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