These two have identical logical definitions in human-phenotype-xp:
HP:0001336 ! Myoclonus [DEF: "Very brief, involuntary random muscular contractions occurring at rest, in response to sensory stimuli, or accompanying voluntary movements."]
HP:0002123 ! Generalized myoclonic seizures [DEF: "Seizures with sudden, brief (< 100 msec) involuntary single or multiple contraction(s) of muscles(s) or muscle groups of variable topography (axial, proximal limb, distal)."]
Remove one - presumably the xp for HP:0002123.
Note that these two terms are unrelated in HP, except at the level of abnormaluty of the nervous system. Time for a new relationship type?