# 9C
import math
g.norefresh()
g.antialias(0)
g.paper(0)
g.refresh()

def field(r, color=100):
    hit = 'nohit'

    m1 = g.getMouse(1)
    m2 = g.getMouse(2)
    boundaries = (100-r-1,100+r+1)
    if (m1 in boundaries and m2 <= 100+r+1 and m2 >= 100-r-1) or (m2 in boundaries and m1 <= 100+r+1 and m1 >= 100-r-1):
        hit = (m1,m2)

    g.pen(color)        
    g.line(100-r,100-r,100+r,100-r)
    g.line(100-r,100-r,100-r,100+r)
    g.line(100+r,100-r,100+r,100+r)
    g.line(100-r,100+r,100+r,100+r)
    g.line(100-r-1,100-r-1,100+r+1,100-r-1)
    g.line(100-r-1,100-r-1,100-r-1,100+r+1)
    g.line(100+r+1,100-r-1,100+r+1,100+r+1)
    g.line(100-r-1,100+r+1,100+r+1,100+r+1)
    g.refresh()

    return hit
    
def connect(hits,color=100):
    g.pen(color)
    numhits = len(hits)
    numlines = numhits*(numhits-1)/2
    hitsleft = hits
    for hit1 in hits:
        hitsleft = hits[1:]
        for hit2 in hitsleft:
            g.line(hit1[0],hit1[1],hit2[0],hit2[1])

    g.refresh()

hits = []
i = 1
while not g.getMouse(3):
    g.paper(0)
    i = i % 99 + 1
    hit = field(i,10)
    if hit != 'nohit':
        hits.append(hit)
        connect(hits)
        g.pause(3)
        i = 1

g.paper(100)
g.antialias(1)
connect(hits,0)
g.refresh()