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export default function modifyString(s: string): string {    return s.includes("?")        ? modifyString(            Array.prototype.map                .call(s, (c, i, a) =>                    c === "?"                        ? a[i + 1] === "?" ? c : ["a", "b", "c"].filter(                            (v) =>                                v !== a[i + 1] && v !== a[i - 1],                        )[0]                        : c)                .join(""),        )        : s;}