How can I fix this warning? I read that it can be ignored in most of cases but I want to fix it.
Underfull \hbox (badness 10000) in paragraph at lines 16--17
\documentclass[lettersize,journal]{IEEEtran}
\usepackage{amsmath,amsfonts}
\usepackage{algorithmic}
\usepackage{algorithm}
\usepackage{array}
\usepackage[caption=false,font=normalsize,labelfont=sf,textfont=sf]{subfig}
\usepackage{textcomp}
\usepackage{stfloats}
\usepackage{url}
\usepackage{verbatim}
\usepackage{graphicx}
\usepackage{cite}
\begin{document}
\section{Introduction}
Two lists $(x_5,y_9,z_3,t_1,m_8,n_3,q_9,k_6)$ and $(x_4,y_2,z_4,t_1,m_5,n_3,q_9,k_2)$ have the same size and same forms.
\end{document}
Another question is about "Unused global option(s)". What options specificly are they talking about here?
This is the warnings I got when I ran that code.
(I'm using overleaf if that make it different)