Question 4:
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8 UNKNOWNs, 2 points each, 16 points.

The following class dictionary is not LL1.

SchemaItem	: 
		  Annotation |
		  Attribute |
		  SequenceGroup |
		  Comment .

Annotation	= "<" [ <prefixS> NSRef ] "annotation>".
Attribute	= "<" [ <prefixS> NSRef ] "attribute".
SequenceGroup	= "<" [ <prefixS> NSRef ] "sequence".
Comment		= "<!--" <comment> String "-->".

NSRef		= <namespace> Ident ":".

The following class dictionary defines the same language
and is LL1. Find the UNKNOWNs.

SchemaItem	: 
                  AAS |
		  Comment
		  .

UNKNOWN1 = UNKNOWN2 [ <UNKNOWN3> UNKNOWN4 ] Rest.
UNKNOWN5 :
		  AnnotationR |
		  AttributeR |
		  SequenceGroupR .

AnnotationR	= UNKNOWN6.
AttributeR	= UNKNOWN7.
SequenceGroupR	= UNKNOWN8.
Comment		= "<!--" <comment> String "-->".

NSRef		= <namespace> Ident ":".