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