2. Arborescence

♦ “. BINT “: S V R8 ♦ “. LPAS “: S V R8 ♦ “. NBPA “: S V I ♦ “. VALE “: S V R8

sd_listis (k19): := record ♦ “. BINT “: S V I ♦ “. LPAS “: S V I ♦ “. NBPA “: S V I ♦ “. VALE “: S V I