A calf is a young cow. A young female cow, especially one that has not yet had a calf, is called a heifer: H-E-I-F-E-R.

VOA: special.2009.07.21

There was a huge old insurrection called the Fronde, f-r-o-n-d-e.

有一起被称为投石党运动的起义

耶鲁公开课 - 欧洲文明课程节选

So they began to call this A and this B and this C and this D and this E, this F, this G.

他们开始把这叫做A,B和C,这个是D,E,F,G

耶鲁公开课 - 聆听音乐课程节选

Note that there is neither a column E nor F on these spreadsheets.

WHITEHOUSE: Core Requirement Updates Description of Requirement Spreadsheets | The White House

If we tack on Y, Z, D, E, and a little F, then our potential customer pool just exploded.

FORBES: Why Customers Choose To Work With You -- Or Not

For 18 months, the OBV for corn was in a trading range, lines e and f.

FORBES: The Perfect Indicator for All Markets