Every Interesting Program Has At Least One Variable, One Branch, And One Loop.

Every Interesting Program Has At Least One Variable, One Branch, And One Loop.

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Every interesting program has at least one variable, one branch, and one
loop... and at least one bug!

Related:

In every non-trivial program there is at least one bug.
Every program has at least one bug and can be shortened by at least one instruction -- from which, by induction, one can deduce that every program can be reduced to one instruction which doesn't work.
Every program has (at least) two purposes: the one for which it was written and another for which it wasn't.
VIII. Any non-trivial program contains at least one bug. -- Laws of Computer Programming