### Question:
Concept extends PartiallyOrdered<Concept> { @Override public boolean isLessOrEqualTo(final Concept that) { return this.intent.equals(this.and(that)); } Concept(final MutableBitSet extent, final MutableBitSet intent); MutableBitSet extent(); MutableBitSet intent(); @Override boolean apply(final Concept that); @Override boolean isLessThan(final Concept that); @Override boolean isLessOrEqualTo(final Concept that); @Override boolean isGreaterThan(final Concept that); @Override boolean isGreaterOrEqualTo(final Concept that); @Override boolean equals(final Object that); @Override int hashCode(); @Override String toString(); @Override Concept intersect(final Concept that); @Override Concept union(final Concept that); @Override double measure();  }### Answer:
@Test public void testLessOrEqualTo() { assertTrue(X.isLessOrEqualTo(X)); assertTrue(X.isLessOrEqualTo(S)); assertFalse(S.isLessOrEqualTo(X)); assertFalse(W.isLessOrEqualTo(X)); }