[以下「いか」] => Less than A, under/below A (amount) N1
Degree/ Level/Amount
て[以来「いらい」] => After A, B (continuous action/condition N2
Information, Report
[以上「いじょう」] => Because of A, B (is an expected/natural result), Now that A, B, More than (or including) A , More than (or including) A N2
Reason, Result, Response