Minecraft wiki entry for execute, associated text: All needed sub-commands can be concatenated together. Subcommands other than the run subcommand can be arranged arbitrarily and used multiple times. But the run subcommand can only be used once and must be put at the end of the subcommands chain. A run subcommand or a condition subcommand finalizes the command, otherwise the command does nothing. The game processes these subcommands in order from front to end, for example, the following commands are different: