outer mac: _u1 (hello,world)
inner mac: _u1 (hello,world)
outer mac: _u2 (goodbye,world)
inner mac: _u2 (goodbye,world)
outer rept before: _u3
inner rept before: _u3
outer for: _u4 ($0)
inner for: _u4 ($0)
outer for: _u5 ($1)
inner for: _u5 ($1)
outer for: _u6 ($2)
inner for: _u6 ($2)
outer rept after: _u3
inner rept after: _u3
outer rept before: _u7
inner rept before: _u7
outer for: _u8 ($0)
inner for: _u8 ($0)
outer for: _u9 ($1)
inner for: _u9 ($1)
outer for: _u10 ($2)
inner for: _u10 ($2)
outer rept after: _u7
inner rept after: _u7
