To illustrate, if you had a map that pointed to a treasure lying buried “50 rods east of the well in the town park, ” you might find the directions puzzling ​ — especially if you did not know where this well was, or how long a ‘ rod ’ was.
परन्तु सामान्य अर्थ में, यह हमें सिर्फ़ जानकारी की दो बातें ढूँढ़ने के लिए कहती है: आरंभ - बिन्दु और समय की अवधि ।