根据名称的部分匹配合并列表中数据框的元素

I have a list:

我有一个清单:

lst <- list(a1=dfa1, a2=dfa2, b1=dfb1, b2=dfb2)

dfa1 <- data.frame(x=c(1:5), y=c(2, 5, 7, 9, 10))
dfa2 <- data.frame(x=c(1:6), y=c(3, 8, 1, 2, 4, 13))
dfb1 <- data.frame(x=c(1:4), y=c(7, 9, 3, 2))
dfb2 <- data.frame(x=c(1:7), y=c(9, 3, 5, 1, 7, 9, 11))
lst <- list(a1=dfa1