An attempt to show how a block could look like following simple rules
Research of one shift - 4,2 - line
Research of one shift - 4,2 - compact
Research of two shifts - 2,2,2 - line
Research of two shifts - 2,2,2 - compact
Research of one shifts - 2,4,2 - line
Research of one shifts - 2,4,2 - compact
Research of one shift - 4,2 - line
Research of one shift - 4,2 - compact
Research of two shifts - 2,2,2 - line
Research of two shifts - 2,2,2 - compact
Research of one shifts - 2,4,2 - line
Research of one shifts - 2,4,2 - compact