Study the given information carefully to answer the given questions. In a certain code language,
'good work definitely pays' is written as 'bd jq hl pr'
'you did good job' is written as 'on pr dm st'
'job pays good amount' is written as 'pr mi on jq'
'did he work properly' is written as 'hi zy st ex'
(all codes are two-letter codes only)
What is the code for 'properly' in the given code language?