instructions()

Execution opens with a warning about the possibility of termination due to some arithmetic anomaly. ParaBas included a reference to lines 250-370, which handled emergencies via the ONERROR mechanism. Python systems will run nonstop through any calculation, delivering IEEE standard 754 results when possible, and offering exception handling via try - except.

def instructions():
    """Self-explanatory user instructions"""
    instr = [
        "Lest this program stop prematurely, i.e. before displaying\n",
        "    `END OF TEST',\n",
        ""
        "try to persuade the computer NOT to terminate execution when an",
        "error like Over/Underflow or Division by Zero occurs, but rather",
        "to persevere with a surrogate value after, perhaps, displaying some",
        "warning.  If persuasion avails naught, don't despair but run this",
        "program anyway to see how many milestones it passes, and then",
        "amend it to make further progress.\n"
    ]
    print_msgs(instr)
    return