BEFORE EXTENDS BASE 3
block1 extends base 1
block2 extends base 2
block3 extends base 3
    BEFORE ALL
    block1 embed base 1

    AFTER ALL

    block4 extends extends
    parent=block4 extends base 3

    block1=block1 extends base 1

    block2=block2 extends base 2

    block3=block3 extends base 3

AFTER EXTENDS BASE 3