Format 1

1  REPLACE + 
2.1   ==    ==  BY   ==    == 
2.1? 
2.2.1 
2.2.2.1 LEADING
2.2.2.1 TRAILING
2.2.1  == 
2.2.1 
2.2.1  == 
2.2.1 BY
2.2.1  == 
2.2.1 
2.2.1  ==   .