function main(array, letter) {

  var x = names(array);//console.log("x= ", x);
  var y = firstNames(x); //console.log("y= ", y);
  var z = countLetter(array,y,letter); //console.log("z= ", z);

  var p = names(z); //console.log("p= ", p);
  var q = firstNames(p);console.log("q= ", q); //console.log("mother before 1923= ",q);
  //console.log("People with two 'e' in first name are: ", q);

  var q1 = findMother(array); //console.log("Mother= ",q1);
  var q11 = names(q1);//console.log("q11= ", q11);
  var q2 = moreThanOneSon(q1); //console.log("q2= ",q2);
  var q21 = names(q2);//console.log("q21= ", q21);
  var q3 = oneSon(q11,q21); //console.log("q3= ",q3);
  var q4 = getSonData(q3,array); //console.log("q4= ", q4);

  var eAge = eAgeFunc(z,q4); console.log("Age difference= "+eAge);
  console.log("YESSSSSS! FINALLYYYYYYY !!!!" );
}

function eAgeFunc(aryAll, aryMom){
 var avg1=0, avgM=0, diff=0;
  avg1 = averageAge(aryAll);
  avgM = averageAge(aryMom);
  diff = avg1 - avgM;
  if (diff< 0){
    diff = avgM - avg1;
  }
  return diff;
}

function averageAge(array){
  var sumAge=0, avgAge=0;
  for (var i=0; i<array.length; i++){
    sumAge = sumAge + (array[i].died - array[i].born);
	}
  avgAge = sumAge/(i-1);
  return avgAge;
}

function getSonData(array1,stkarray){
  var temp=[], nameDone="";
   for (var i=0; i<array1.length; i++){
     for (var j=0; j<stkarray.length; j++){
       if (array1[i] == stkarray[j].name){
      temp[i] = stkarray[i];
           nameDone=stkarray[i];
         }
      }
   }console.log("temp= ",temp);
  return temp;
}

function oneSon(s1, s2){
  var temp=[],  countS1=0,countS2=0, ck=0, t=[], a=0, count1=[], count2=[];
  var newS1=[];
  countS1 = counter(s1); console.log("count= "+count);
  countS2 = counter(s2); console.log("count= "+count);
  count2 = initialize(count1, countS1);
for (var i=0; i<s1.length; i++){
  for (var j=0; j<s2.length; j++){
    if (s1[i] == s2[j])
      count2[i] ++;
  }
}
  for (var i=0; i<s1.length; i++){
    if(count2[i] == 1){
      newS1.push(s1[i]);
    }
  }
  console.log("count2= "+count2);
 console.log("newS1= ", newS1);
  return newS1;
}

function initialize(array, count){
  for (var i=0; i<count; i++){
    array[i] = 0;
  }
  return array;
}
function counter(array, action){
  var sum=0;
  for (var i=0; i<array.length; i++){
    sum++;
  }
  return sum;
}

function moreThanOneSon(array){
  var temp =[];
      for (var i=0; i<array.length; i++){
        for (var j=0; j<array.length; j++){
          if(array[i] == array[j]){
            temp.push(array[i]);
        }
      }
    }
return temp;
}


function findMother(array){
  var mother1923=[], mother=[];
  mother = forEach(array, function(x){return x.mother;});
  for (var i=0; i<mother.length; i++){
    for (var j=0; j<array.length; j++){
         if(mother[i] === array[j].name){
              if (array[i].born < 1923){
                mother1923.push(array[j]);
              }
          }
    }
};
return mother1923;
}


function forEach(array, action){
  var temp =[];
  for (var i=0; i<array.length; i++){
    temp[i] = action(array[i]);
  }
  return temp;
}

function names(array){
  var temp1 = [];
  temp1 = forEach(array, function(x){return x.name;});
  return temp1;
}

function firstNames(array){
  var temp2=[], temp3=[];
  temp2 = forEach(array, function(x){return x.split(" ");});
  console.log(temp2);
  for (var i=0; i<temp2.length; i++){
    temp3[i] = temp2[i][0];
  }
  return temp3;
}
function countLetter(stockarray, array,letter){
  var temp6=[], temp7=[];
  for(var i=0; i<array.length; i++){
  temp6[i] = count(array[i],letter);

 	}
  for (var k=0; k<temp6.length; k++){
    if(temp6[k] == 2){
      temp7.push(stockarray[k]);
    	};
	}
  return temp7;
}
function count(name,letter){
  var temp4=0, sum=0;
 	for (var j=0; j<name.length; j++){
      if(name.charAt(j) == letter){sum++;};
    }
  return sum;
}

  main(ancestry, "e");