9C9N: Wrong indented flow sequence
9HCY: Need document footer before directives
9JBA: Invalid comment after end of flow sequence
CVW2: Invalid comment after comma
EB22: Missing document-end marker before directive
QB6E: Wrong indented multiline quoted scalar
RHX7: YAML directive without document end marker
S98Z: Block scalar with more spaces than first content line
SU5Z: Comment without whitespace after doublequoted scalar
X4QW: Comment without whitespace after block scalar indicator