longDescription = """
Removes at-rules which have the same identifier as another; for example two
instances of `@keyframes one`. As the browser will only count the *last* of
these declarations, all others can safely be removed.
"""

inputExample = """
@keyframes one {
    0% {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}
@keyframes one {
    0% {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(359deg);
    }
}
.box {
    animation-name: one;
}
"""

outputExample = """
@keyframes one {
    0% {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(359deg);
    }
}
.box {
    animation-name: one;
}
"""