How to find connecting line

Hi,
I have a spatial table with geom type as 2002.
I have a set of line (for example lets say it is 5 rows) attach image.
I need to find line that is inner connecting to these 5 rows. What I mean is a boundary line has inner line.
I am unable to get inner lines of a boundary.
If I query spatial table I get boundary line but i want inner lines.
attach is snapshot for ref.
thanks in advance
saaz

Thanks B Hall and Stefan Jager @@for your inputs.
Actually, in my database that has spatial geometry information has SDO_GTYPE is 2002 for ids that are connected to each other.
and I have a second table that has no spatial geometry by a polygon information (more than one line).
so for example in my poly_tab and line_tab
poly_tab
poly_id     line_id
46951     1001
46951     1005
46951     1009
46951     1032
46951     1036
56102     1072
56102     1079
56102     1082
39024     1050
39024     1045
........ and so on (note no spatial geometry column here and line_id is fk to line_tab and this table has line geom)
also to be noted here that 1002 and 1003 has no record in poly_tab table.
line_tab
line_id   mdsys.geometry(sdo_gtype
1001        2002
1005        2002
1009        2002
1032        2002
1036        2002
1072        2002
1079        2002
1082        2002
1050        2002
1045        2002
1002        2002
1003        2002
1019        2002
lets says if I query poly_tab where poly_id = 46951
it should display
line_id
1001
1005
1009
1032
1036
1002
1003
note 1002 and 1003 are inner lines for this polygon but in poly_tab this line does not exits. (in poly table only boundary line exists)
@Stefan Jager
thanks in advance
saaz

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