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public class WordScrambler {

  // 4+ letters, 2+ distinct inners
  // \p{IsLatin} equals [a-zA-ZÀ-ÿ]
  // Range [À-ÿ]: accented letters
  private static final Pattern WORD_REGEX =
    Pattern.compile("\\p{IsLatin}(\\p{IsLatin})\\1*(?!\\1)\\p{IsLatin}\\p{IsLatin}+");

  // Scramble words within text

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package wscrambler

import java.io.File

// 4+ Latin letters, 2+ distinct inners
private val WORD_REGEX =
  """\p{IsLatin}(\p{IsLatin})\1*(?!\1)\p{IsLatin}\p{IsLatin}+"""
    .toRegex()

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val reader = File(filename).reader()

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val reader: java.io.InputStreamReader =
 /*new*/ java.io.File(filename).reader()

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final var reader =
  new InputStreamReader(
    new FileInputStream(
      new File(filename)));

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// Collect readers from args/stdin
val readers =
  if (args.isNotEmpty())
    args.map { File(it).reader() }
  else
    listOf(System.`in`.reader())

// Swallow all readers into one string
val content =

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// Collect readers from args/stdin
final Stream<BufferedReader> readers;
if (args.length > 0) {
  readers = Arrays.stream(args)
    .map(filename -> {
      try {
        return new BufferedReader(
          new FileReader(filename));
      } catch (Exception e) {

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import java.io.*;
import java.util.*;
import java.util.regex.*;
import java.util.stream.*;

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final var wordRegex =
  Pattern.compile("\\p{InLatin}{4,}")

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val wordRegex =
  """\p{InLatin}{4,}""".toRegex()