Assertion: proton's quark | /r/HasProperty | d
Facets:
Source sentences:
text: The A proton (p) is composed of two up quarks (u) and one down quark (d): uud.
text: A neutron (n) has one up quark (u) and two down quarks (d): udd.
text: The A proton (p) is composed of two up quarks (u) and one down quark (d): uud.
text: A neutron (n) has one up quark (u) and two down quarks (d): udd.
text: (u) swaps for a down quark (d) in the neutron, turning the neutron into a proton.