Javascript inner array iteration

can you help me please with iteration the array , Here is my code

https://jsfiddle.net/Ar2zee/9g91ouq6/1/

var projects = {
  "projects" : [[
    "Title : Portfolio",
    "Dates : 2017",
    "Description : Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nesciunt voluptatem ex eius sapiente eum quod nostrum esse dolorem sequi deleniti!",
     ["images/1.jpg","images/2.jpg","images/3.jpg","images/4.jpg"]
  ],
  [
    "Title : Social Network",
    "Dates : 2019",
    "Description : Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nesciunt voluptatem ex eius sapiente eum quod nostrum esse dolorem sequi deleniti!",
    ["images/1.jpg" , "images/2.jpg" , "images/3.jpg" , "images/4.jpg"]
  ]]
};

for (var i = 0 ; i < projects.projects[3].length; i++) {
  var formattedImage = HTMLprojectImage.replace("%data%",projects.projects[3][i])
}

How to iterate thru images ? Thank you so Much !