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46- AND (&&), OR (||) operators
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56: Transactions 1: account to contract
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Sade - Smooth Operator - Official - 1984
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60) Call external function from inside the contract: "this"
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50- Contract Interactions 2: virtual & override
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57: Transactions 2: contract to account
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4 Essential Accounting Tips for Truckers: Do It the Correct Way!
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58: Transactions 3: account - contract - account
