en Kjaer's 2 Under the merger doctrine when the dominate and subservient property enjoy unity of ownership the casement merges and is extinguished. Amon v. Grimes, 364 Pa. Super. 243. 247. 527 A.2d 1045, 1047 (1987). The 1965 Deed, which precedes Karen Kjaer's 1979 deed cannot act as the written instrument bec