path	value/explanation	url	count
invalid value (1 variant(s))			3
Leader/05 (leader05)	" "		3
undefined subfield (4 variant(s))			12
886	f		3
886	c		3
886	x		3
886	z		3
repetition of non-repeatable subfield (1 variant(s))			3
886$a	there are multiple instances		3