**Solution:**

```
public static boolean isAcronym(String s1, String s2) {
if (s1.length() != s2.length()) return false;
HashMap<Character, Integer> charCounts = new HashMap<>();
// Calculate chracter counts
for (int i = 0; i < s1.length(); i++) {
if (charCounts.containsKey(s1.charAt(i))) {
charCounts.put(s1.charAt(i), charCounts.get(s1.charAt(i)) + 1);
} else {
charCounts.put(s1.charAt(i), 1);
}
}
// Compare counts with characters in s2
for (int i = 0; i < s2.length(); i++) {
if (charCounts.containsKey(s2.charAt(i))) {
charCounts.put(s2.charAt(i), charCounts.get(s2.charAt(i)) - 1);
} else {
return false;
}
}
// Check all letters matched
for (int count : charCounts.values()) {
if (count != 0) return false;
}
return true;
}
```

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