7. Examples

1. All these are equivalent:

        f90 a.f
        f90 -O 2 a.f
        f90 -O vector2,scalar2,task1 a.f
        f90 -O scalar2 a.f
        f90 -O task1 a.f

2. These are equivalent:

        f90 -O 3 a.f
        f90 -O vector3,scalar3,task2 a.f

3. These are invalid:

        f90 -O  a.f              # Can't use "-O" all by itself
        f90 -O 2,vector1         # Can't mix general and specific
        f90 -O vector3,scalar0   # Not a valid combination

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