Should not have two subj relations with the same governor (except with expletives).
An example with expletive:
Two subjects
Validation Pebble
- Schema: SUD
pattern { X -[1=subj]-> X1; X -[1=subj]-> X2; X1 << X2; }
without { X -[subj@expl]-> X1}
without { X -[subj@expl]-> X2}
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