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diff --git a/vendor/golang.org/x/text/internal/format/plural/plural.go b/vendor/golang.org/x/text/internal/format/plural/plural.go
new file mode 100644
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+++ b/vendor/golang.org/x/text/internal/format/plural/plural.go
@@ -0,0 +1,38 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package plural defines the grammatical plural feature.
+//
+// The definitions in this package are based on the plural rule handling defined
+// in CLDR. See
+// http://unicode.org/reports/tr35/tr35-numbers.html#Language_Plural_Rules for
+// details.
+package plural
+
+import "golang.org/x/text/internal/format"
+
+// Form defines a plural form. The meaning of plural forms, as well as which
+// forms are supported, vary per language. Each language must at least support
+// the form "other".
+type Form byte
+
+const (
+	Other Form = iota
+	Zero
+	One
+	Two
+	Few
+	Many
+)
+
+// Interface is implemented by values that have a plural feature.
+type Interface interface {
+	// PluralForm reports the plural form of a value, depending on the
+	// language declared by the given state.
+	PluralForm(s format.State) Form
+}
+
+// TODO
+// - Select function
+// - Definition for message package.