create implication vocaloid (1547) -> vocal_synth (0)
create implication utau (810) -> vocal_synth (0)
create implication voiceroid (76) -> vocal_synth (0)
create implication synthesizer_v (29) -> vocal_synth (0)
create implication voicevox (56) -> vocal_synth (0)
create implication piapro_studio (2) -> vocal_synth (0)
create implication chipspeech (1) -> vocal_synth (0)