tree_seq1(n, i, j)

Package :
parser
Type :
procedure

Suspend the sequence of nodes X1, X2, ... Xn, held in the following node structure :-

n / \ n Xn / \ n Xn-1 / ... n / \ &null X1

The indices of the child tree/leaf may be supplied, but default to 1, 2 respectively.

A single EmptyNode is the empty list, and just fails.

Source