# direct
D1: @{
    D1 Char<b>
    Char<a>
}
'D1' print(D1)

# indirect 1: currently not working, see issue #95 for details
I1: @{
    I1? Char<a>
}
'I1' print(I1)

# indirect 2: currently not working, see issue #95 for details
X: Y 'c'
Y: Z 'b'
Z: X | Y | Char<a>
'I2' print(Z)

#---
#D1abbb
#I1aaaa
#I2abbcb
#---
#((("a", "b"), "b"), "b")
#a
#a