| ndx1 ≠ [], # ndx = # gndx ⊦ transaction-prefix(ndx + nd ' + ndx1, gndx) → transaction-prefix(ndx + nd ' + ndx1, gndx + mkgnode(nd, n, ndx = [], false) ') |
# ndx = # gndx, transaction-prefix(ndx + nd ' + ndx1, gndx) ⊦ ndx1 = [], transaction-prefix(ndx + nd ' + ndx1, gndx + mkgnode(nd, n, ndx = [], false) ')