Lab directory copied

mid/bulk/head_072.c

mid/bulk/head_073.c

mid/bulk/head_074.c

mid/bulk/head_075.c

mid/bulk/head_076.c

mid/bulk/head_077.c

mid/bulk/head_078.c

mid/bulk/head_079.c

mid/bulk/head_080.c

mid/bulk/head_081.c

mid/bulk/head_082.c

mid/bulk/head_083.c

mid/bulk/head_084.c

mid/bulk/head_085.c

mid/bulk/head_086.c

mid/bulk/head_087.c

mid/bulk/head_088.c

mid/bulk/head_089.c

mid/bulk/head_090.c

mid/bulk/head_091.c