Lesson 22: SIG subscript 77 (2/2)
Click every "SIG subscript 77" sign below, then press submit or type 's'.
Click every "SIG subscript 77" sign, then press submit or type 's'.
Click every "SIG subscript 77" sign below, then press submit or type 's'.
Click every "SIG subscript 77" sign, then press submit or type 's'.