11 string references to 'B' in Service Container 7.2

Unicode::mimeHeaderDecode in lib/Drupal/Component/Utility/Unicode.php

Decodes MIME/HTTP encoded header values.

x01.php in lib/Drupal/Component/Transliteration/data/x01.php

x02.php in lib/Drupal/Component/Transliteration/data/x02.php

x03.php in lib/Drupal/Component/Transliteration/data/x03.php

x04.php in lib/Drupal/Component/Transliteration/data/x04.php

x05.php in lib/Drupal/Component/Transliteration/data/x05.php

x10.php in lib/Drupal/Component/Transliteration/data/x10.php

x1d.php in lib/Drupal/Component/Transliteration/data/x1d.php

x1e.php in lib/Drupal/Component/Transliteration/data/x1e.php

x21.php in lib/Drupal/Component/Transliteration/data/x21.php

xff.php in lib/Drupal/Component/Transliteration/data/xff.php