create implication 550_bc (1) -> 6th_century_bc (3)
create implication 1238 (1) -> 13th_century (4)
create implication 1606 (1) -> 17th_century (55)
create implication 1690 (1) -> 17th_century (55)
create implication 1704 (1) -> 18th_century (86)
change category 550_bc (1) -> meta
change category 1238 (1) -> meta
change category 1606 (1) -> meta
change category 1690 (1) -> meta
change category 1704 (1) -> meta