{"summary":
"Crater
lake
trolley",
"transaction":
{
"amount":
100.0,
"attendees":
[
"ycled2012@gmail.com",
"Xingyun27221@gmail.com",
"Chbeiyou@gmail.com",
"zhangdi@umich.edu"
],
"paidby":
[
"zhangdi@umich.edu"
]
}
}