Point out serializable schedules in the following L

1

= w 2

(y)w 1

(y)r 3

(y)r 1

(y)w 2

(x)r 3

(x)r 3

(z)r 2

(z)

L 2

= r 3

(z)r 3

(x)w 2

(x)r 2

(z)w 1

(y)r 3

(y)w 2

(y)r 1

(y)

L 3

= r 3

(z)w 2

(y)w 2

(x)r 1

(y)r 3

(y)r 2

(z)r 3

(x)w 1

(y)

L 4

= r 2

(z)w 2

(y)w 2

(x)w 1

(y)r 1

(y)r 3

(y)r 3

(z)r 3

(x)