.one {
    color: red;

    &__two {
      color: blue;

      &__three {
        color: green;
      }
    }

    &__two-again {
      color: pink;
    }
}

.one__two {
  color: red;

  &--modifier {
    color: blue;
  }

  &__three {
    color: green;
  }

  &--modifier__three {
    color: white;
  }
}

.block {
  color: red;
}

.block__element-one {
  color: red;
}

.block__element-one__element-two {
  color: red;
}

%one__two {
  color: red;
}

%one__two__three {
  color: blue;
}

%one__two__three__four {
  color: blue;
}