def _mature(subseq, absolute, c, size=33, total=5000):
    """Create mature sequences around start/end"""
    reads = dict()
    probs = [0.1, 0.2, 0.4, 0.2, 0.1]
    end = 5 + size
    error = [-2, -1, 0, 1, 2]
    for error5 in error:
        for error3 in error:
            s = 5 - error5
            e = end - error3
            seen = subseq[s:e]
            counts = int(probs[error5 + 2] * probs[error3 + 2] * total) + 1
            name = 'seq_%s_%s_%s_x%s' % (c, s + absolute, e + absolute, counts)
            reads[name] = seen, counts
    return reads
