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package index
import "strings"
func prefixCount(words []string, pref string) int {	return ReduceSlice(words, func(a int, v string) int {		if strings.HasPrefix(v, pref) {			return a + 1		}		return a	}, 0)}
func ReduceSlice(s []string, c func(a int, v string) int, i int) int {
	for _, v := range s {		i = c(i, v)	}	return i}