remove implication 1st_century_bc (6) -> ancient_art (2127)
remove implication 6th_century_bc (3) -> ancient_art (2127)
remove implication 12th_century_bc (3) -> ancient_art (2127)
remove implication 13th_century_bc (1) -> ancient_art (2127)
create implication 1st_century_bce (0) -> before_common_era (18)
create implication 6th_century_bce (0) -> before_common_era (18)
create implication 12th_century_bce (0) -> before_common_era (18)
create implication 13th_century_bce (0) -> before_common_era (18)
change category 1st_century_bce (0) -> meta
change category 6th_century_bce (0) -> meta
change category 12th_century_bce (0) -> meta
change category 13th_century_bce (0) -> meta