1 | 8. ( n@0: .
( l:Alph*. ||l|| < n@0  ( a. a':Alph*. ||a'|| < n n & R((a @ b),a' @ b) & R((a @ c),a' @ c))(l)) 
( l:Alph*. ||l|| = n@0  ( a. a':Alph*. ||a'|| < n n & R((a @ b),a' @ b) & R((a @ c),a' @ c))(l)))

( l:Alph*. ( a. a':Alph*. ||a'|| < n n & R((a @ b),a' @ b) & R((a @ c),a' @ c))(l)) a':Alph*. ||a'|| < n n & R((a @ b),a' @ b) & R((a @ c),a' @ c) |