using multiple match clauses doesn't return an

I am executing the following two queries and i am getting some result.

First query

START 
person=node:NODE_TYPE(NODE_TYPE='PERSON') 
MATCH 
(person)-[?:contacts]->(var1)-[?:addresses]->(var2)-[?:details]->(var3)-[?:items]->(var4)-[?:items]->(var5)-[?:value]->(var6) 
WHERE 
var2.`#nodeId` ='at0000' and var3.`#nodeId` ='at0001' and var4.`#nodeId` ='at0002' and var5.`#nodeId` ='at0028' and var6.`value` =~'address.*' 
return distinct person;

Second query

START 
person=node:NODE_TYPE(NODE_TYPE='PERSON') 
MATCH 
(person)-[?:contacts]->(var1)-[?:addresses]->(var2)-[?:details]->(var3)-[?:items]->(var4)-[?:value]->(var5) 
WHERE 
var2.`#nodeId` ='at0000' and var3.`#nodeId` ='at0001' and var4.`#nodeId` ='at0009' and var5.`value` =~'india.*' 
return distinct person;

But when I combine the two queries to a single query to get persons that match both these conditions, it isn't working.

the combined query is

START 
person=node:NODE_TYPE(NODE_TYPE='PERSON')  
MATCH 
(person)-[?:contacts]->(var1)-[?:addresses]->(var2)-[?:details]->(var3)-[?:items]->(var4)-[?:items]->(var5)-[?:value]->(var6) , (person)-[?:contacts]->(var7)-[?:addresses]->(var8)-[?:details]->(var9)-[?:items]->(var10)-[?:value]->(var11) 
WHERE 
var2.`#nodeId` ='at0000' and var3.`#nodeId` ='at0001' and var4.`#nodeId` ='at0002' and var5.`#nodeId` ='at0028' and var6.`value` =~'address.*' and 
var8.`#nodeId` ='at0000' and var9.`#nodeId` ='at0001' and var10.`#nodeId` ='at0009' and var11.`value` =~'india.*' 
return distinct person;

This query return an empty iterator.

I used 'comma' to combine the MATCH conditions and 'and' to combine the WHERE conditions. Is there any problem in this?

(I am implementing a query builder to build cypher query. I have to check multiple condition matches. What is the best way to do this?)

Neo4j 1.9M04

You may be running into the "identifier uniqueness" condition described here (see first post by Michael Hunger). If you got a match on the same (person) node and have only 1 :contacts relation from there, then the identifier var1 is "using up" the connected node in this match and var7 can't be assigned to the same node.

In other words, a node found by a match statement can only be used by one identifier within the same match statement.

You can try to use a WITH clause instead followed by another MATCH to work around this issue.

START 
person=node:NODE_TYPE(NODE_TYPE='PERSON') 
MATCH 
(person)-[?:contacts]->(var1)-[?:addresses]->(var2)-[?:details]->(var3)-[?:items]->(var4)-[?:items]->(var5)-[?:value]->(var6) 
WHERE 
var2.`#nodeId` ='at0000' and var3.`#nodeId` ='at0001' and var4.`#nodeId` ='at0002' and var5.`#nodeId` ='at0028' and var6.`value` =~'address.*' 
with distinct person
MATCH 
(person)-[?:contacts]->(var1)-[?:addresses]->(var2)-[?:details]->(var3)-[?:items]->(var4)-[?:value]->(var5) 
WHERE 
var2.`#nodeId` ='at0000' and var3.`#nodeId` ='at0001' and var4.`#nodeId` ='at0009' and var5.`value` =~'india.*' 
return distinct person;