create implication 1st_century_bc (6) -> before_common_era (18)
create implication 2nd_century_bc (0) -> before_common_era (18)
create implication 3rd_century_bc (0) -> before_common_era (18)
create implication 4th_century_bc (0) -> before_common_era (18)
create implication 5th_century_bc (0) -> before_common_era (18)
create implication 6th_century_bc (3) -> before_common_era (18)
create implication 7th_century_bc (0) -> before_common_era (18)
create implication 8th_century_bc (0) -> before_common_era (18)
create implication 9th_century_bc (0) -> before_common_era (18)
create implication 10th_century_bc (0) -> before_common_era (18)
create implication 11th_century_bc (0) -> before_common_era (18)
create implication 12th_century_bc (3) -> before_common_era (18)
create implication 13th_century_bc (1) -> before_common_era (18)
create implication 14th_century_bc (0) -> before_common_era (18)