"""Cut degenerate repetition from generated transliterations: stop at the third consecutive
repeat of a word n-gram (n = 1..4) or of a character block of 2..12 characters."""
import re


def cut_loops(text):
    words = text.split()
    out = []
    for w in words:
        out.append(w)
        for n in (1, 2, 3, 4):
            if len(out) >= 3 * n and out[-n:] == out[-2 * n:-n] == out[-3 * n:-2 * n]:
                del out[-2 * n:]
                return " ".join(out)
    s = " ".join(out)
    m = re.search(r"(.{2,12}?)\1{2,}", s)
    if m:
        s = s[: m.start() + len(m.group(1))]
    return s