DEFINE2 ;
upgrade true
downgrade true
VERSION 0.0.0
; a
VERSION l1
; b+
upgrade true
RESTORE
VERSION l2a
; c
VERSION l3
DEFINE2 ;
upgrade true
downgrade true
VERSION 0.0.0
; a
VERSION l1
; b+
upgrade true
RESTORE
VERSION l2a
; c
VERSION l3