(p -> p)
((C1 -> C2) (C1 -1C2))
y1((xRy1) z1((xRz1) -> z2((z1Rz2) (y1Rz2))))
# - -
@ - -
#' - -1 -
@' - -1 -
[n] -
<n> -
[n]'-
<n>'-
& - -
| - -
~ - -
-> -
<- -
<-> -