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// run
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// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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func main() {
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m := "0"
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for _, c := range "321" {
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m = max(string(c), m)
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println(m)
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}
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}
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