# [Python 2], 108 bytes

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 def f(s):k=s.count;return[all(k(s[0])==k(c)>1for c in s)]####...111aaaceedddfiii]][[klloon000ruutt;;;:::=>>>

[Try it online!][TIO-je8m5iy2]

[Python 2]: https://docs.python.org/2/
[TIO-je8m5iy2]: https://tio.run/##ZVHHsqIAELz7FZjBgGAWBHPOOVCoREUQkGD22115r/awtXPpnj70TM/od@ugqfEPp/EC4fF4PrwgAiJoQphMmDCn2aqFG4JlGyrFKAoogyaF0BBByCAHkaioGQAHSCpgQrT3WzAMoyjKMAwnCDzPi5Ik0TRFyYqiaSqCIIZtWxaO4xiGESRJfr4DYdMyJB2EXMJN4ABnDZfL5fiajq/n68V4Ig66UQAF3AzgRn97luU4nhcEUdzvHQUduedbcSKV0mVDer7ellzt0fNjv01stkmQCRCFlLZiIuj18BonV50Z4M1xbu8ImAbEHWaefMXlJWrvF/khpLwXQ7IePCqJ24kP5lqCr9fHp0alXIlZ61Y31Ihn2HtNhfeI3DmwYz/ZiMIpvcl1Eai93plYiLrFJ4901n/ZNLVsmBIiz0HprBYStfygfl2CePFu0@FHJqbz51nVg7kAQDck1fq5@z/hf5KyrBP2l3IOsCMxPeFKKR5Lbpk2VKXjoU3vAtbeHTajFWnZEC6LgjBF6gu89Wpj0g3w59yJ@vWEh2brRnOXtebk/o7elvlJbFDK9K1y8M0BdnDu60ZWykp/eikYPgb2Uzl71KPpsdKYdb3b/AapVNad4Uisxv0mdBCi5d7YRtXCmZdi7tSZuKo@zWDCy8hw8Hg0@wcCTD5Pu0Su9TKpcK0YuJP/Rf3hrr@K83zo8wc "Python 2 – Try It Online"