https://challenge.perlcampaign.com/register/4-week-challenge-week-1/2026-07-21T09:54:01+00:00https://challenge.perlcampaign.com/register/4-week-challenge-week-2/2026-07-21T09:54:09+00:00https://challenge.perlcampaign.com/register/4-week-challenge-week-3/2026-07-21T09:54:22+00:00https://challenge.perlcampaign.com/register/4-week-challenge-week-4/2026-07-21T09:54:34+00:00