!header
!!header
!!!header

test!header
!header!header
!!!!header

!header__bld__
!header{{__bldmns__}}test
!header{{__''bldmnsitl''__}}

!hea----der
!header----
!header\\test
!header\\\
!header__bld-----__

!hea__der
!!head__er
!hea{{der
!!head}}er

//replace this string in editor to header(clearing newline)
test
test
test