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export function concat(xs: string[]): string {
return xs.reduce((a, b) => a + b, "");
}
export function capitalize(s: string): string {
return toUpperCase(s.charAt(0)) + toLowerCase(s.slice(1));
}
export function toUpperCase(s: string): string {
return s.toUpperCase();
}
export function toLowerCase(s: string): string {
return s.toLowerCase();
}
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