--- &a1 !!str scalar1
--- &a2 !!str scalar2
--- &a3 !!str scalar3
--- &a4 !!map
&a5 !!str key5: value4
---
a6: 1
&anchor6 b6: 2
--- !!map
&a8 !!str key8: value7
--- !!map
&a10 !!str key10: value9
--- &a11 !!str value11