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\documentclass{letter}

\usepackage[margin=2cm]{geometry}
\usepackage{graphicx}
\usepackage{wrapfig}

\signature{Cookie Monster}

\address{Cookie Monster\\
Sesame Street}

\begin{document}

\begin{letter}{Kermit the Frog\\
Sesame Street}

\opening{Dear Kermit the Frog,}

\begin{minipage}{7.5in ...

Try adding this in your document: Those words cannot be broken after that line is processed.

\documentclass[12pt]{letter}

\usepackage[margin=2cm]{geometry}
\usepackage{graphicx}
\usepackage{wrapfig}

\signature{Kermit the Frog}

\address{Kermit the Frog\\
123 sesame street\\
New York, NY 12312}

\begin{document}

\begin{letter}{Cookie Monster\\
345 sesame street\\
New York, NY 12312 ...

I'm writing a letter, and I need to insert a large image. I have some specific text that must wrap around this image.

The wrapfig environment works as far as floating the image (because it's too large for the page that it would normally fall on, and it's moved to the next page as a result). It also ...