create implication 1397 (1) -> 14th_century (13)
create implication 1544 (1) -> 16th_century (40)
change category 1397 (1) -> meta
change category 1544 (1) -> meta
change category 7th_century (1) -> meta
change category 3rd_century (0) -> meta # missing
change category 4th_century (0) -> meta # missing
change category 5th_century (0) -> meta # missing
change category 6th_century (0) -> meta # missing
change category 8th_century (0) -> meta # missing
change category 9th_century (0) -> meta # missing
change category 11th_century (0) -> meta # missing