The so-called synesthesia is a wonderful mixture of various organ functions, and communication between several sensory regions usually irrelevant in the brain. According to the above definition, which of the following is situations that belong to synesthesia? ['Wang Li turned on the FM radio. As soon as the host spoke, he felt that his left thigh, shoulders, and even his left ear were uncomfortable. He had to turn off the radio.', 'Soldier Liu Chengwu feels sweet to eat watermelon, eat a few more, and diarrhoea.', 'When a singer heard that a new song was looking for someone to sing, he entrusted the record company to discuss the price with the producer of the new song.', 'Huang Dawei, a deaf teenager, communicates with his family, each time by writing, which is slow.']