create implication vocaloid (1129) -> vocal_synth (0)
create implication utau (682) -> vocal_synth (0)
create implication voiceroid (69) -> vocal_synth (0)
create implication synthesizer_v (9) -> vocal_synth (0)
create implication voicevox (51) -> vocal_synth (0)
create implication piapro_studio (2) -> vocal_synth (0)
create implication chipspeech (1) -> vocal_synth (0)