Find Intersect of Range of number

I have two column sub range of natural number ( N ) :
col1 col2
0-2 12-13
7-11 18-21
20-25 28-30
tips: a-b is equal [a,b] in N
OK, I wanna compare each cell of col1 with all of cell in col2 and find intersect sub range,
for example ( 20-25 on col1 )
20-25 compare with 18-21 and get this result ( intersect ) : 20-21


or, you can suppose sheet to this form, too:
col1 col2 col3 col4
0 2 12 13
7 11 18 21
20 25 28 30

Originally Posted by sourabhg98

Check the attached

Thank you so much dear sourabhg98

please check this file for some small problem

RE1_SUBRANGEINTERSECT.xlsx

Originally Posted by sourabhg98

Can there be more then one intersections too??

yes, more than one intersections between column one item AND column two items

sudo code
for i=1 to count(col1)
for j=1 to count(col2)
check(col1[i],col2[j])

for example 1 :
col1 col2
1-2 1-15
4-6 -
3-5 -
Answer :
1-2
4-6
3-5

for example 2 :
col1 col2
1-4 0-6
- 1-9
- 2-15
Answer is :
1-4
1-4
2-4

thanks.