{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
{}
{1, 3, 5, 7, 9, 10, 8, 6, 4, 2}
{"ax", "ay", "bx", "by", "cx", "cy"}
{procedure Seqimage, procedure main}
{"a(b,c)", "1(2(3,4),5)", "a(2,8(a,c(d,e)))"}