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.block {
  background-color: black;
}
.block__element {
  background-color: red;
}
.block .block__element {
  background-color: red;
}

// ----
// Sass (v3.3.0)
// Compass (v1.0.0.alpha.18)
// ----

.block {
    background-color: black;
    &__element {
        background-color: red;
    }
    & &__element {
        background-color: red;
    }
}