SetAclPrincipals for user1 u2 ACLOptions=[mergePreserve]
  AclLine REMOVE_ALL {paths=[/libs, /apps]}
  AclLine ALLOW {paths=[/content], privileges=[jcr:read]}
SetAclPrincipals for user1 u2 ACLOptions=[mergePreserve, someOtherOption, someOther123, namespaced:option]
  AclLine REMOVE_ALL {paths=[/libs, /apps]}
  AclLine ALLOW {paths=[/content], privileges=[jcr:read]}