Format 1: WRITE statement for sequential files

1  WRITE  ?  FROM 
1 ? 
2.1 BEFORE
2.1 AFTER
1? ADVANCING
2.1 
2.2.1 
2.2.1 
2.2.1 LINE
2.2.1 LINES
2.1 
2.1 PAGE %phrase 1
1  %invalid_key %not_invalid_key
2 ? END-WRITE