STLD : Switching Theory and Logic Design
SOP circuit to detect the decimal numbers 5 through 12 in a 4 bit gray code output
Truth table, K-map & logic circuit

Lec-74 : https://youtu.be/Ywl_gj9Kh6Y
Lec-76 : https://youtu.be/zWxnMhHt5aU