Provide at least 5 social security numbers of patients with a prevalent disease with a prevalence percentage lower than 30% of the average prevalence percentage of conditions.
social security number refers to ssn; prevalence percentage lower than 30% of the average prevalence percentage of conditions refers to PREVALENCE PERCENTAGE < MULTIPLY(0.3, AVG(PREVALENCE PERCENTAGE));
SELECT DISTINCT T2.ssn FROM conditions AS T1 INNER JOIN patients AS T2 ON T1.PATIENT = T2.patient INNER JOIN all_prevalences AS T3 ON lower(T1.DESCRIPTION) = lower(T3.ITEM) WHERE CAST(T3."PREVALENCE PERCENTAGE" AS REAL) * 100 / ( SELECT AVG('PREVALENCE PERCENTAGE') FROM all_prevalences ) < 30 LIMIT 5