AUTO (Auto) keyword for display files

Under some circumstances, the AUTO keyword is equivalent to the CHECK keyword.

The AUTO keyword is equivalent to the CHECK keyword as follows:

AUTO(RA) : CHECK(ER)

AUTO(RAB) : CHECK(RB)

AUTO(RAZ) : CHECK(RZ)

The format of the keyword is:

AUTO(RA [RAB | RAZ])  AUTO(RAB | RAZ)

The CHECK keyword is preferred.