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| \  / || | || | ||  /  ___||   / _ \\   | \| || 
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| .  . || | \\_/ || | \\_\ || |  ___  || | .  || 
|_|\/|_||  \____//   \____//  |_||  |_|| |_|\_|| 
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Text this: Representation of problem solving in Singaporean primary Mathematics textbooks with respect to types, polya's model and heuristics