euphoria syntax

and by constant do else elsif end exit for function global if include not or procedure return then to type while with without xor abort and_bits append arctan atom c_func call c_proc call_func call_proc clear_screen close compare command_line cos date equal find find_from floor getc getenv gets get_key get_pixel integer length log machine_func machine_proc match match_from mem_copy mem_set not_bits object open or_bits peek peek4s peek4u pixel platform poke poke4 position power prepend print printf profile puts rand remainder repeat routine_id sequence sin sprintf sqrt system system_exec tan task_clock_stop task_clock_start task_create task_list task_schedule task_self task_status task_suspend task_yield time trace xor_bits
-- exist