CRB and String

CRB has two strings $s$ and $t$.
In each step, CRB can select arbitrary character $c$ of $s$ and insert any character $d$ ($d\ ≠\ c$) just after it.
CRB wants to convert $s$ to $t$. But is it possible?

There are multiple test cases. The first line of input contains an integer $T$, indicating the number of test cases. For each test case there are two strings $s$ and $t$, one per line.
1 ≤ $T$ ≤ $10^{5}$
1 ≤ $|s|$ ≤ $|t|$ ≤ $10^{5}$
All strings consist only of lowercase English letters.
The size of each input file will be less than 5MB.

For each test case, output "Yes" if CRB can convert s to t, otherwise output "No".

4
a
b
cat
cats
do
do
apple
aapple

No
Yes
Yes
No

KUT（DPRK）

2015 Multi-University Training Contest 10