is this count as a linear order relation?

say A is:

$A=\left \{ \left \{ a \right \}, \left \{ a,b \right \}\right \}$

and R being:

$R=\left \{( \left \{ a \right \},\left \{ a \right \}), (\left \{ a,b \right \},\left \{ a,b \right \}),(\left \{ a \right \},\left \{ a,b \right \}) \right \}$

and let's say the relation is "subset of" (if it matters).

is this count as a linear order relation?

TIA!