create implication vocaloid (1306) -> vocal_synth (0)
create implication utau (707) -> vocal_synth (0)
create implication voiceroid (73) -> vocal_synth (0)
create implication synthesizer_v (11) -> vocal_synth (0)
create implication voicevox (54) -> vocal_synth (0)
create implication piapro_studio (2) -> vocal_synth (0)
create implication chipspeech (1) -> vocal_synth (0)