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