
//define[@01]
//define[@02]


a
//ifndef[@01]
b
//ifdef[@02]
//define[@03]
1
//else
2
//endif
b
//else
c
//ifdef[@02]
//define[@04]
3
//else
4
//endif
c
//endif
d

//ifdef[@03]
@03
//endif

//ifdef[@04]
@04

//endif
