Here are the Google Classroom codes by hour:

1st  37sebbs

2nd  mxnfg4f

3rd  5d2kea5

4th  4x5txzx

Here are the Kahn Academy codes by hour:

1st  HV64UPXN

2nd  PTZRGJS2

3rd  XYJ2WMT5

4th  ZRN9GKYS