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True random number generators can be hardware random-number generators (HRNGS) that generate random numbers, wherein each generation is a function of the current value of a physical environment's attribute that is constantly changing in a manner that is practically impossible to model. This means that the particular outcome sequence will contain some patterns detectable in hindsight but unpredictable to foresight. Random number generation is a process by which, often by means of a random number generator ( RNG), a sequence of numbers or symbols that cannot be reasonably predicted better than by random chance is generated. When a cubical die is rolled, a random number from 1 to 6 is obtained. Dice are an example of a mechanical hardware random number generator.