x amp;amp;y ?x:y
xamp;amp;y?x:y;
x;
y
lt;gt;?lt;gt; ;:lt;gt;?
x?y?
xamp;amp;y?x?y?amp;amp;x?yc0?0xamp;amp;yx?y0 ?x?y?0?
x?y?0?xxx?y0?yy
xamp;amp;y?x:y;
x;
y
lt;gt;?lt;gt; ;:lt;gt;?
x?y?
xamp;amp;y?x?y?amp;amp;x?yc0?0xamp;amp;yx?y0 ?x?y?0?
x?y?0?xxx?y0?yy