int chooseLen(final int n) {
    int x = this.rand(100);
    if (x < 90) {
      return this.rand(Math.min(8, n)) + 1;
    } else if (x < 99) {
      return this.rand(Math.min(32, n)) + 1;
    } else {
      return this.rand(n) + 1;
    }
  }
Create a corpus

@param dirs The directory to store the corpus files
testfuzz/src/main/java/org/hyperledger/besu/testfuzz/javafuzz/Corpus.java