How to find list within list conatins specific string value using linq

Dim MainList As List(Of List(Of String)) = New List(Of List(Of String)) From _
	{ _
		New List(Of String) From {"a","b","c"}, _
		New List(Of String) From {"d","a","f", "c", "h"}, _
		New List(Of String) From {"i","c"}, _
		New List(Of String) From {"k","d","h"}, _
		New List(Of String) From {"e","o","p"}, _
		New List(Of String) From {"q","f","s", "g", "u"}, _
		New List(Of String) From {"v","z","g","z"} _
	}

Dim SearchValue As String = "a"

'#1
'returns sublists containing serached value
Dim subListContainingSerachedValue = _
	MainList _
	.Where(Function(x) x.Contains(SearchValue)) _
	.ToList()
	

'#2
'returns AnonymousType(Of String, String, Boolean)
Dim OnlySearchedValues = _
	MainList _
	.SelectMany(Function(x) _
			x.Select(Function(y) New With _
				{
					.OrigValue = y, _
					.SearchedValue = SearchValue, _
					.IsOnTheList = y.Any(Function(z) z=SearchValue) _
				}) _
		) _
	.ToList()

List<String> {"a", "b", "c"} 
List<String> {"d", "a", "f", "c", "h"} 

OrigValue SearchedValue IsOnTheList
a a True 
b a False 
c a False 
d a False 
a a True 
f a False 
c a False 
h a False 
i a False 
c a False 
k a False 
d a False 
h a False 
e a False 
o a False 
p a False 
q a False 
f a False 
s a False 
g a False 
u a False 
v a False 
z a False 
g a False 
z a False