3
3
.
.
1
1
P
P
r
r
o
o
p
p
e
e
r
r
t
t
y
y
W
W
r
r
a
a
p
p
p
p
e
e
r
r
s
s
I
I
n
n
f
f
o
o
Property
Wrappers a
re constr
ucts tha
t can be assigned
to a
variable
to alte
r its behavior.
