1. Let kermit = frog("Kermit", 3, 4). Not sensible
2. Let kermit = green("Kermit"). Sensible
3. Let kermit = yellow("Kermit"). Not sensible
4. Let kermit = yellow(3,4). Sensible
5. Let yellow(x,y) = yellow(4,7). Sensible
6. Let green(s) = yellow(4,7). Not sensible