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removed unnecessary call to the description property

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Classic Computer Science Problems in Swift.playground/Pages/Chapter 4.xcplaygroundpage
- Contents.swift

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Original file line number	Diff line number	Diff line change
`@@ -407,7 +407,7 @@ cityGraph2.addEdge(from: "Boston", to: "New York", weight: 190)`
`407`	`407`	`cityGraph2.addEdge(from: "New York", to: "Philadelphia", weight: 81)`
`408`	`408`	`cityGraph2.addEdge(from: "Philadelphia", to: "Washington", weight: 123)`
`409`	`409`
`410`		`-print(cityGraph2.description)`
	`410`	`+print(cityGraph2)`
`411`	`411`
`412`	`412`	`/// Find the total weight of an array of weighted edges`
`413`	`413`	`/// - parameter edges The edge array to find the total weight of.`

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