R u sure this is easy level?!


  • 0
    Y

    I spent one hour to solve this puzzle with grep but failed. I thought it was totally NOT easy level! Or that means I'm in low level?
    I failed in these cases:(
    1-1-706-7938
    +31 365-492-5931
    37 9-858-6497
    +978-878-1324
    -686-511-4033

    I suggest move this question into at least "Medium"


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