There are 2^4 or 16 of them since there are 4 elements.

{}  The empty set, has 0 elements
{11}
{12}   These 4 have just 1 element, they are called "singletons"
{13}
(14)
{11,12}
{11,13}
{11,14}     These 6 have 2 elements
{12,13}
{12,14}
{13,14}
{11,12,13}
{11,12,14}  These 4 have 3 elements
{11,13,14}
{12,13,14}
{11,12,13,14}  This 1 has all four elements.  It is not considered a
               PROPER subset, since it is the WHOLE, not really deserving
               of the prefix "sub" but it is considered a subset anyway.

Edwin