0 used between possibilities, or before the last of many possibilities -- أو
1 used after a negative verb to mean not one thing and also not another -- أو
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
يمكننا إكماله خطوة بخطوة مهما كان طول الطريق ولا يمكن إكماله مهما كان الطريق قصيرا إذا لم تقم حتى بتحديد بصمتك.