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- func IsIsogram(s string) bool {
- seen := map[rune]bool{}
- for _, char := range s {
- char = unicode.ToLower(char)
- if 'a' <= char && char <= 'z' {
- if _, ok := seen[char]; ok {
- return false
- }
- seen[char] = true
- }
- }
- return true
- }
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