Almost catching up in mixed level 5e parties

While a level two character goes to level three,

• a level one character goes to level two

While a level three character goes to level four,

• a level one character goes to level three

While a level four character goes to level five,

• a level one character goes to level four

While a level five character goes to level six,

• a level one character goes to level five

While a level six character goes to level seven,

• a level one character goes to level five

While a level seven character goes to level eight,

• a level one character goes to level five

While a level eight character goes to level nine,

• a level one character goes to level six

While a level nine character goes to level ten,

• a level one character goes to level six

While a level ten character goes to level eleven,

• a level one character goes to level six
• a level four character goes to level seven
• a level six character goes to level eight

While a level eleven character goes to level twelve,

• a level one character goes to level six

While a level twelve character goes to level thirteen,

• a level one character goes to level six
• a level five character goes to level seven
• a level six character goes to level eight

While a level thirteen character goes to level fourteen,

• a level one character goes to level six
• a level five character goes to level seven
• a level six character goes to level eight

While a level fourteen character goes to level fifteen,

• a level one character goes to level seven
• a level six character goes to level eight
• a level seven character goes to level nine

While a level fifteen character goes to level sixteen,

• a level one character goes to level seven
• a level five character goes to level eight
• a level seven character goes to level nine
• a level eight character goes to level ten

While a level sixteen character goes to level seventeen,

• a level one character goes to level seven
• a level five character goes to level eight
• a level seven character goes to level nine
• a level eight character goes to level ten

While a level seventeen character goes to level eighteen,

• a level one character goes to level eight
• a level six character goes to level nine
• a level eight character goes to level ten
• a level nine character goes to level eleven
• a level ten character goes to level twelve
• a level eleven character goes to level thirteen
• a level twelve character goes to level fourteen

While a level eighteen character goes to level nineteen,

• a level one character goes to level eight
• a level six character goes to level nine
• a level eight character goes to level ten
• a level nine character goes to level eleven
• a level ten character goes to level twelve
• a level eleven character goes to level thirteen
• a level twelve character goes to level fourteen

While a level nineteen character goes to level twenty,

• a level one character goes to level nine
• a level six character goes to level ten
• a level nine character goes to level eleven
• a level ten character goes to level twelve
• a level eleven character goes to level thirteen
• a level twelve character goes to level fourteen
• a level thirteen character goes to level fifteen