function readOnly(count){ }
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Log into Trailhead.
Click on your image in the upper-right and select Profile.
Scroll down to the bottom of the page and view the “Email” field (your email is only visible to you)
http://certification.force.com/pkb/articles/Public_KB/Trailhead-Account-Email
OR
https://trailhead.salesforce.com/help?article=Find-the-username-and-password-for-your-Trailhead-Playground
But I Know Email Id, And I just want to know the trailhead account related to that email id.