OPEN Statement -- Format 1 -- Sequential
>>-OPEN--------------------------------------------------------->
.------------------------------------------------------.
| .--------------------------------------. |
V V | |
>----+-INPUT----file-name-1--+---------------------+-+--+-+----><
| +-REVERSED------------+ |
| '-+------+--NO REWIND-' |
| '-WITH-' |
| .--------------------------------------. |
| V | |
+-OUTPUT----file-name-2--+---------------------+-+-+
| '-+------+--NO REWIND-' |
| '-WITH-' |
| .-------------. |
| V | |
+-I-O----file-name-3-+-----------------------------+
| .-------------. |
| V | |
'-EXTEND----file-name-4-+--------------------------'
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