" The Dreamstone " ( 1983 ) and " The Tree of Swords and Jewels " ( 1983 ) have been republished in several omnibuses , some with substantial revisions .
Head entity: the tree of swords and jewels Q7770096 9 10 11 12 13 14
Tail entity: the dreamstone Q7730995 1 2
Relation (head \u2192 tail): P155
Inverse relation (tail \u2192 head): P156