add a+b+ab,b+c+bc,c+a+ac
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Step-by-step explanation:
a+b+ab+(b+c+bc)+(c+a+ac)
=a+b+ab+b+c+bc+c+a+ac
=a+a+b+b+c+c+ab+bc+ac
=2a+2b+2c+ab+bc+ac
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