From Rosetta Code

Plan was the assemble language used on the old 1900 ICL mainframe machines. This can be used by Emulation software now

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This programming language may be used to instruct a computer to perform a task.
See Also:

Listed below are all of the tasks on Rosetta Code which have been solved using Plan.
Your Help Needed
If you know Plan, please write code for some of the tasks not implemented in Plan.

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