Question 335362
{{{drawing(300,300,-2,6,-2,6,grid(1),
circle(1,1,.2),
circle(4,2,.2),
circle(1,3,.2),
graph(300,300,-2,6,-2,6,0))}}}
.
.
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The y distance from the new point to the other right hand side point needs to be 2 units. It can be two units above or below. 
So the possible points are 
(4,2+2)
(4,4)
{{{drawing(300,300,-2,6,-2,6,grid(1),
circle(1,1,.2),
circle(4,2,.2),
circle(1,3,.2),
line(1,1,4,2),
line(4,2,4,4),
line(4,4,1,3),
line(1,3,1,1),
circle(4,4,.2),
graph(300,300,-2,6,-2,6,0))}}}
.
.
.
(4,2-2)
(4,0)
{{{drawing(300,300,-2,6,-2,6,grid(1),
circle(1,1,.2),
circle(4,2,.2),
circle(1,3,.2),
line(1,1,4,0),
line(4,0,4,2),
line(4,2,1,3),
line(1,3,1,1),
circle(4,0,.2),
graph(300,300,-2,6,-2,6,0))}}}